Multiple Choice Questions

Acids, Bases and Salts

Updated for CBSE 2027
Board Exam Preparation
129+ Practice Questions
Notes

Practice Questions with Answers

Total 129 questions available

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Q. 1
Which of the following is used for dissolution of gold?
A
Nitric acid
B
Hydrochloric acid
C
Aqua regia
D
Sulphuric acid
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Q. 2
Nature of the aqueous solution of common salt is:
A
Acidic
B
Alkaline
C
Basic
D
Neutral
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Q. 3
The pH range most conducive for life of fresh water plants and animals is :
A
3.5-5.0
B
9.0-10.5
C
6.5-7.5
D
2.0-3.5
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Q. 4
Acid present in apple is :
A
Oxalic acid
B
Malic acid
C
Acetic acid
D
Formic acid
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Q. 5
When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to:
A
absorb the evolved gas
B
moisten the gas
C
absorb moisture from the gas.
D
absorb Clions from the evolved gas
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Q. 6
The H + ion concentration of a solution is 1.0×10-5m. The solution is
A
Neutral
B
Acidic
C
Amphoteric
D
Alkaline
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Q. 7
Which of the following gives the correct increasing order of acidic strength ?
A
Hydrochloric acid < Water < Acetic acid
B
Water < Acetic acid < Hydrochloric acid
C
Water < Hydrochloric acid < Acetic acid
D
Acetic acid < Water < Hydrochloric acid
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Q. 8
If pH of solution is 13, it means that if is
A
Weakly basic
B
Strongly Basic
C
Strongly acidic
D
Weakly acidic
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Q. 9
Rain is called acid rain when its:
A
pH falls below 5.6
B
pH is above 7
C
pH falls below 6
D
pH falls below 7
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Q. 10
What is the nature of the solution formed by dissolving D in water?
A
Acidic
B
Alkaline
C
Neutral
D
Insoluble
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Q. 11
Which one of the following is acidic in nature?
A
Sodium hydroxide solution
B
Gastric juice
C
Blood plasma
D
Lime water
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Q. 12
Brine is an
A
aqueous solution of sodium carbonate
B
aqueous solution of sodium hydroxide
C
aqueous solution of sodium bicarbonate
D
aqueous solution of sodium chloride
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Q. 13
A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolved)
A
Calcium chloride, carbondioxide
B
Calcium oxide, hydrogen
C
Calcium carbonate, hydrogen
D
Calcium Carbonate, Carbon dioxide
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Q. 14
Compound C of sodium forms a:
A
White powder
B
Black powder
C
Liquid solution
D
Gaseous compound
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Q. 15
Acids react with metal carbonates to liberate ______ gas.
A
Hydrogen
B
Carbon monoxide
C
Carbon dioxide
D
Water
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Q. 16
Acids react with bases to form salt and water. This reaction is known as:
A
Decomposition
B
Neutralisation
C
reduction
D
Combination
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Q. 17
Which of the following is not a mineral acid ?
A
Nitric acid
B
Sulphuric acid
C
Citric acid
D
Hydrochloric acid
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Q. 18
Which of the following statements is true for acids ?
A
Sour and change blue litmus to red)
B
Bitter and change blue litmus to red)
C
Sour and change red litmus to blue.
D
Bitter and change red litmus to blue.
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Q. 19
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
A
Hydrochloric acid
B
Baking powder
C
Lime
D
Ammonium hydroxide solution
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Q. 20
When copper oxide and dilute hydrochloric acid react, colour changes to
A
black
B
white
C
blue-black
D
bluish-green
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Q. 21
Lime water reacts with chlorine to give
A
bleaching powder
B
baking powder
C
baking soda
D
washing soda
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Q. 22
Dilute acid does not produce carbon dioxide on being treated with:
A
Limestone
B
Marble
C
Lime
D
Baking soda
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Q. 23
When a bee stings, immediately a paste of lime is put on the sting. Why?
A
Bee sting contains an acid called formic acid) It gets neutralised with CaO
B
Bee sting is acidic due to hydrochloric acid and this is neutralised
C
All of the above.
D
Bee sting is made of a base
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Q. 24
Acids react with bases to form salt and water. This reaction is known as:
A
Neutralisation
B
Combination
C
reduction
D
Decomposition
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Q. 25
Baking soda is a mixture of:
A
Sodium carbonate and acetic acid
B
Sodium carbonate and tartaric acid
C
Sodium hydrogen carbonate and tartaric acid
D
Sodium hydrogen carbonate and acetic acid
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Q. 26
Which among the following is compound F?
A
CO2
B
H2CO3
C
NaOH
D
H2O
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Q. 27
When dissolved in water, the hydrated salt forms:
A
Weak base
B
Strong acid
C
Strong base
D
Weak acid
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Q. 28
A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolve
A
Calcium oxide, hydrogen
B
Calcium carbonate, hydrogen
C
Calcium chloride, carbondioxide
D
Calcium Carbonate, Carbon dioxide
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Q. 29
Bleaching powder is used as a disinfectant for water to:
A
Make water tastier
B
Make water germ-free
C
Make water clear
D
Remove all the dirt from water
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Q. 30
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
A
Lime
B
Baking powder
C
Hydrochloric acid
D
Ammonium hydroxide solution
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Q. 31
Sodium hydroxide turns phenolphthalein solution
A
yellow
B
colourless
C
pink
D
orange
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Q. 32
Which one of the following types of medicines is used for treating indigestion?
A
Analgesic
B
Antacid
C
Antiseptic
D
Antibiotics
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Q. 33
An indicator is one kind of the following compound
A
Weak base or acid only
B
Strong acid only
C
Complex salt
D
Reducing agent
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Q. 34
Ammonium sulphate salt is
A
Complex salt
B
Neutral salt
C
Basic salt
D
Acidic salt
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Q. 35
How is the strength of an alkali represented on the pH scale?
A
Decrease in pH value
B
Increase in pH value
C
pH value remains constant
D
Inverse relation to pH value
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Q. 36
How are pure crystals of NaCl separated from soluble impurities?
A
Evaporation
B
Distillation
C
Crystallization
D
Sublimation
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Q. 37
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
A
After washing with plenty of water apply solution of sodium hydroxide on the hand.
B
Wash the hand with saline solution
C
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.
D
Neutralise the acid with a strong alkali.
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Q. 38
Sodium carbonate is a basic salt because it is a salt of
A
weak acid and strong base.
B
strong acid and weak base.
C
weak acid and weak base.
D
strong acid and strong base.
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Q. 39
Which one of the given is incorrect?
A
Aqueous solutions of acids conduct electricity
B
None of these
C
Acids turns blue litmus paper red
D
Acids react with certain metals to form hydrogen gas
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Q. 40
Which of the following compounds is alkaline in an aqueous medium?
A
CuSO4
B
NaCl
C
Na2CO3
D
H2CO3
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Q. 41
Which of the following salts do not contain water of crystallisation?
A
Gypsum
B
Blue vitriol
C
Washing soda
D
Baking soda
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Q. 42
Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
(i) It turns lime water milky.
(ii) It extinguishes a burning splinter.
(iii) It dissolves in a solution of sodium hydroxide.
(iv) It has a pungent odour.
A
(i), (ii) and (iii)
B
(i) and (ii)
C
(ii), (iii) and (iv)
D
(i) and (iv)
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Q. 43
A strong acid:
A
Partially gets ionized in water
B
Do not get ionized in water
C
Completely gets ionized in water
D
All the these
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Q. 44
A drop of liquid sample was put on the pH paper, paper turned blue. The liquid sample must be of
A
Sodium bicarbonate
B
Lemon Juice
C
Ethanoic aci(d)
D
HCl
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Q. 45
What does a higher hydronium ion concentration correspond to on the pH scale?
A
Neutral pH
B
Higher pH value
C
pH value of 7
D
Lower pH value
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Q. 46
When you add a few drops of acetic acid to a test tube containing sodium bicarbonate powder, which one of the following is your observation ?
A
No reaction takes place
B
A colourless gas with pungent smell is released with brisk effervescence
C
Formation of bubbles of a colourless and odourless gas.
D
A brown coloured gas is released with brisk effervescence.
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Q. 47
Methyl orange is
A
Pink in acidic medium, colourless in basic medium.
B
Colourless in acidic medium, pink in basic medium
C
Pink in acidic medium, yellow in basic medium
D
Yellow in acidic medium, pink in basic medium
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Q. 48
Which of the following is acidic in nature ?
A
Human blood
B
Lime water
C
Antacid
D
Lime juice
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Q. 49
Some fruits like mango, lemon, raw grapes, orange, et(c) , have a sour taste due to the presence of:
A
Acetic acid
B
Oxalic acid
C
Citric acid
D
Lactic acid
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Q. 50
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
A
Wash the hand immediately with plenty of water and apply paste of sodium hydrogen carbonate.
B
After washing with plenty of water, applies solution of sodium hydroxide on the hand)
C
Neutralize the acid with a strong alkali.
D
Wash the hand with saline solution.
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Q. 51
Acids react with metal carbonates to liberate ______ gas.
A
Carbon monoxide
B
Hydrogen
C
Carbon dioxide
D
Water
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Q. 52
How are the impurities removed from the salt solution during crystallization?
A
Distillation
B
Filtration
C
Evaporation
D
Crystallization
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Q. 53
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
A
Baking powder
B
Lime
C
Ammonium hydroxide solution
D
Hydrochloric acid
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Q. 54
Adding common salt to water will result in:
A
Flames in water
B
no change in pH of the water
C
decrease in pH of the water
D
increase in pH of the water
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Q. 55
Which of the following salts does not contain water of crystallisation?
A
Gypsum
B
Washing soda
C
Baking soda
D
Blue vitriol
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Q. 56
Acids react with metals to liberate _________gas.
A
Water
B
Hydrogen
C
Carbon dioxide
D
Carbon monoxide
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Q. 57
Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?
A
Vanilla essence
B
Petunia leaves
C
Turmeric
D
Litmus
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Q. 58
What is done to separate insoluble impurities from the saturated salt solution?
A
Filtration
B
Evaporation
C
Distillation
D
Crystallization
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Q. 59
What gas is passed through the saturated salt solution to separate out pure NaCl crystals?
A
Nitrogen gas
B
Oxygen gas
C
Hydrogen gas
D
Hydrochloric acid (HCl) gas
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Q. 60
Which one of the given is true, if a substance has a pH value of 4?
A
The substance is a neutral substance
B
Either (1) or (2)
C
The substance is a base
D
The substance is an acid
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Q. 61
What happens to the pH value as the concentration of hydronium ions increases?
A
pH value decreases
B
pH value increases
C
pH value remains constant
D
pH value fluctuates
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Q. 62
Tooth enamel is made up of
A
calcium carbonate
B
calcium oxide
C
potassium
D
calcium phosphate
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Q. 63
A solution reacts with crushed egg-shells to give a gas that turns lime-water milkey. The solution contains
A
HCl
B
LiCl
C
KCl
D
NaCl
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Q. 64
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
A
Vinegar
B
An antacid
C
Lemon juice
D
Common salt
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Q. 65
An aqueous solution with pH-zero is
A
Acidic
B
Amphoteric
C
Alkaline
D
Neutral
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Q. 66
The odour of acetic acid resembles that of
A
Kerosene
B
Vinegar
C
Rose
D
Burning Plastic
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Q. 67
Calcium phosphate is present in tooth enamel. Its nature is
A
basic
B
amphoteric
C
neutral
D
acidic
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Q. 68
While preparing soap a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?
A
To favour the precipitation of the soap
B
To enhance the cleansing power of the soap
C
To reduce the basic nature of the soap
D
To make the soap neutral
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Q. 69
Choose the correct statement:
A
NaCl shows hygroscopic properties only due to impurities
B
NaCl is a brown crystalline solid
C
Pure NaCl is soluble in alcohol
D
Pure NaCl is hygroscopic in nature by itself
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Q. 70
Which of the following acid is also known as vinegar?
A
Dilute sulphuric acid
B
Dilute acetic acid
C
Dilute tartaric acid
D
Dilute hydrochloric acid
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Q. 71
What is the nature of the new product which is formed by the action of water on quick lime ?
A
Basic
B
Neutral
C
Amphoteric
D
Acidic
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Q. 72
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to:
A
Absorb the evolved gas
B
Moisten the gas
C
Absorb moisture from the gas
D
Absorb Cl- ions from the evolved gas
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Q. 73
What does compound D become when it absorbs water?
A
Anhydrous
B
Hydrated salt
C
Gaseous compound
D
Liquid solution
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Q. 74
pH of a solution having hydrogen ion concentration of 1M is
A
0
B
1
C
10
D
14
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Q. 75
What compound does the hydrated salt form when dissolved in water?
A
Compound C
B
Compound D
C
Compound F
D
Compound G
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Q. 76
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?
A
Baking power
B
Hydrochloric acid
C
Lime
D
Ammonium hydroxide solution
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Q. 77
Alkalis are
A
acids, which are soluble in water
B
acids, which are insoluble in water
C
bases, which are soluble in water
D
bases, which are insoluble in water
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Q. 78
Phenolphthalein turns acids to ________ solution.
A
orange
B
pink
C
colourful
D
colourless
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Q. 79
Which range on the pH scale represents acidic solutions?
A
0 to 7
B
7 to 14
C
0 to 14
D
7 only
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Q. 80
Due to excess passing of CO2 through an aqueous solution of slaked lime, its milkiness fades because
A
Due to the production of more heat
B
Calcium carbonate is produced
C
Calcium bi-carbonate is produced
D
Calcium oxide is produced
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Q. 81
Which one of the following will turn red litmus blue?
A
Baking soda solution
B
Lemon juice
C
Soft drinks
D
Vinegar
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Q. 82
The pH value of a sample of hydrochloric acid is 2. pH value of this sample when diluted by adding water will be:
A
no change in pH
B
less than 2 but more than 0
C
more than 7
D
more than 2 but less than 7
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Q. 83
Tooth enamel is made up of
A
potassium
B
calcium phosphate
C
calcium carbonate
D
calcium oxide
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Q. 84
What does the 'p' in pH stand for?
A
Power
B
Potential
C
Particle
D
Proton
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Q. 85
Which of the following statement is not correct?
A
Raw onion can be used as olfactory indicator to check acid or base.
B
Acids turn blue litmus solution red
C
Vanilla essence does not give odour in strongly basic solutions.
D
Bases are sour in taste.
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Q. 86
Which one of the following salts does not con-tain water of crystallisation?
A
Gypsum
B
Washing soda
C
Blue vitriol
D
Baking soda
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Q. 87
Sodium carbonate is a basic salt because it is a salt of a
A
strong acid and weak base
B
weak acid and strong base
C
weak acid and weak base
D
strong acid and strong base
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Q. 88
Sodium carbonate is a basic salt because it is a salt of a
A
weak acid and strong base
B
strong acid and strong base
C
weak acid and weak base
D
strong acid and weak base
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Q. 89
To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is
A
neutral
B
basic
C
corrosive
D
acidic
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Q. 90
Which impurities are particularly undesirable in common salt?
A
Sulphates of sodium and magnesium
B
Chlorides of calcium and magnesium
C
Chlorides of sodium and potassium
D
Oxides of iron and aluminum
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Q. 91
To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is :
A
Basic
B
Corrosive
C
Neutral
D
Acidic
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Q. 92
What kind of solution does compound F form when dissolved in water?
A
Weak acid and strong base
B
Weak acid and weak base
C
Strong acid and weak base
D
Strong acid and strong base
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Q. 93
Sodium carbonate is a basic compound because it is a salt of a:
A
Strong acid and strong base
B
Weak acid and weak base
C
Strong acid and weak base
D
Weak acid and strong base
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Q. 94
The pH of the gastric juices released during digestion is
A
equal to 0
B
equal to 7
C
more than 7
D
less than 7
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Q. 95
Nettle sting is a natural source of which acid?
A
Tartaric acid
B
MetiWanoic acid
C
Citric acid
D
Lactic acid
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Q. 96
What process does the hydrated salt undergo when it loses water molecules in the open air?
A
Hydration
B
Efflorescence
C
Condensation
D
Evaporation
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Q. 97
What pH value represents a neutral solution?
A
0
B
7
C
14
D
Any value between 0 and 14
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Q. 98
What happens when a base is added to vanilla?
A
Vanilla loses its smell
B
Nothing happens
C
Vanilla becomes colorless
D
Color of vanilla changes into red
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Q. 99
Acids react with bases to form salt and water. This reaction is known as:
A
Combination
B
Decomposition
C
reduction
D
Neutralisation
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Q. 100
Which one of the following types of medicines is used for treating indigestion?
A
Analgesic
B
Antacid
C
Antiseptic
D
Antibiotic
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Q. 101
The Ph of a solution of HCL is 4. This shows that the molarity of the solution is
A
0.001M
B
0.0001M
C
4.0M
D
0.4M
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Q. 102
What is the pH value of sodium chloride?
A
More than 7
B
Less than 7
C
Zero
D
7
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Q. 103
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg) ?
A
All of these
B
HNO3
C
H₂SO4
D
HCI
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Q. 104
The chemical formula for plaster of Paris is :
A
CaSO4.1/2 H₂O
B
CaSO4. 2H₂O
C
2CaSO4.H₂O
D
CaSO4. H₂O
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Q. 105
A student puts a drop of reaction mixture of a saponification reaction first on a blue litmus paper and then on a red litmus paper. He may observe that:
A
There is no change in the blue litmus paper and the red litmus paper turns blue.
B
There is no change in the blue litmus paper and the red litmus paper turns white.
C
There is no change in the red litmus paper and the blue litmus paper turns red.
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Q. 106
Which impurities remain in the solution after passing HCl gas?
A
Insoluble impurities
B
Sulphates of sodium and magnesium
C
Chlorides of calcium and magnesium
D
Soluble impurities
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Q. 107
Which one of these acid-base indicators is used by a visually impaired student?
A
Phenolphthalein
B
Vanilla
C
Turmeric
D
Litmus
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Q. 108
Setting of Plaster of Paris takes place due to
A
Hydration
B
Oxidation
C
Reduction
D
Dehydration
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Q. 109
An aqueous solution with pH-zero is
A
Alkaline
B
Neutral
C
Amphoteric
D
Acidic
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Q. 110
When a bee stings, immediately a paste of lime is put on the sting. Why?
A
All of the above.
B
Bee sting contains an acid called formic aci It gets neutralised with CaO .
C
Bee sting is made of a base
D
Bee sting is acidic due to hydrochloric acid and this is neutralised
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Q. 111
How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?
A
Remains the same
B
Becomes zero
C
Increases
D
Decreases
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Q. 112
Calcium phosphate is present in tooth enamel. Its nature is
A
acidic
B
neutral
C
amphoteric
D
basic
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Q. 113
10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be:
A
16 mL
B
4 mL
C
8mL
D
12 mL
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Q. 114
Many salts absorbs water from atmosphere. This property is called
A
addition
B
hydration
C
efflorescence
D
deliquescence
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Q. 115
Chemical formula of baking soda is:
A
Na2CO3
B
NaHCO3
C
MgCO3
D
MgSO4
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Q. 116
Acids react with metals to liberate _________gas.
A
Carbon dioxide
B
Hydrogen
C
Water
D
Carbon monoxide
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Q. 117
Sodium hydroxide is a
A
strong acid
B
strong base
C
weak base
D
weak acid
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Q. 118
When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
A
moisten the gas
B
absorb the evolved gas
C
absorb moisture from the gas
D
absorb Cl– ions from the evolved gas
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Q. 119
When a bee stings, immediately a paste of lime is put on the sting. Why?
A
All of the above.
B
Bee sting is made of a base
C
Bee sting contains an acid called formic acid) It gets neutralised with CaO .
D
Bee sting is acidic due to hydrochloric acid and this is neutralised
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Q. 120
What does a pH value less than 7 indicate?
A
Alkaline solution
B
Neutral solution
C
Acidic solution
D
No solution
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Q. 121
An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.
A
A is strongly acidic and B is a weak acid.
B
A has pH greater than 7 and B has pH less than 7.
C
A has pH less than 7 and B has pH greater than 7
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Q. 122
What is formed when zinc reacts with sodium hydroxide?
A
Sodium zincate and hydrogen gas
B
Zinc hydroxide and sodium
C
Sodium zincate and water
D
Sodium zinc-oxide and hydrogen gas
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Q. 123
When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
A
absorb moisture from the gas
B
absorb Cl– ions from the evolved gas
C
moisten the gas
D
absorb the evolved gas
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Q. 124
Phenolphthalein’s colour in basic medium is ____but in acid it is ______.
A
Yellow, Pink
B
Pink, Colorless
C
Blue, Red
D
Pink, Orange
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Q. 125
In terms of acidic strength, which one of the following is in the correct increasing order?
A
Hydrochloric acid < Water < Acetic acid
B
Water < Acetic acid < Hydrochloric acid
C
Water < Hydrochloric acid < Acetic acid
D
Acetic acid < Water < Hydrochloric acid
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Q. 126
Which of the following gives the correct increasing order of acidic strength ?
A
Hydrochloric acid < Water < Acetic acid
B
Acetic acid < Water < Hydrochloric acid
C
Water < Hydrochloric acid < Acetic acid
D
Water < Acetic acid < Hydrochloric acid
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Q. 127
Black ash is
A
Hydrated KOH
B
Charcoal
C
Barium sulphide
D
Dry KOH
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Q. 128
Compound C is a constituent of:
A
Salt
B
Sugar
C
Baking powder
D
Vinegar
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Q. 129
What does the pH scale measure?
A
Temperature
B
Density
C
Acidity or basicity
D
Pressure
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