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MCQ for Class 10 Science Chapter 2 Acid Bases and Salts

Total questions: 55

Worksheet time: 28mins

Name
Class
Date
1.

Which of the following statements is correct about an aqueous solution of an acid and of a base?

a)

Higher the pH, stronger the acid

b)

Higher the pH, weaker the acid

c)

Lower the pH, stronger the base

d)

Lower the pH, weaker the base

2.

Which one of the following is acidic?

a)

Lemon juice

b)

Tomatoes

c)

Milk

d)

All

3.

Which element is always present in Arrhenius acid?

a)

Oxygen

b)

Nitrogen

c)

Hydrogen

d)

None of these

4.

Which one of the given is true, if a substance has a pH value of 7?

a)

The substance is a base

b)

The substance is a acid

c)

The substance is a neutral substance

d)

Either (1) or (2)

5.

Alkalis are

a)

acids, which are soluble in water

b)

acids, which are insoluble in water

c)

bases, which are insoluble in water

d)

bases, which are soluble in water

6.

Which one of the given acids is used in the treatment of bone marrow and scurvy diseases?

a)

Acetic acid

b)

Hydrochloric acid

c)

Ascorbic acid

d)

Nitric acid

7.

Lime water is

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CaCI2

8.

Which one of the following will turn blue litmus red?

a)

Vinegar

b)

Lime water

c)

Baking soda solution

d)

Washing soda solution

9.

A strong acid:

a)

Completely gets ionized in water

b)

Partially gets ionized in water

c)

Do not get ionized in water

d)

All the these

10.

Sodium hydroxide is a

a)

weak base

b)

weak acid

c)

strong base

d)

strong acid

11.

Which one of the following will turn red litmus blue?

a)

Vinegar

b)

Baking soda solution

c)

Lemon juice

d)

Soft drinks

12.

Sodium hydroxide is used

a)

as an antacid

b)

in manufacture of soap

c)

as a cleans

13.

The nature of calcium phosphate is present in tooth enamel is

a)

Basic

b)

Amphoteric

c)

Acidic

d)

Neutral

14.

Which gas is evolved when acids react with metals?

a)

O2

b)

CO2

c)

H2

d)

N2

15.

Which one of the following is formed when calcium hydroxide reacts with carbon dioxide?

a)

Hydrogen gas

b)

Water

c)

Salt

d)

Both B and C

16.

During the preparation of HCl gas on a humid day, the gas is usually passed through the guard tube containing CaCl₂. The purpose of using CaCl₂ is

a)

To add moisture to the gas (HCl)

b)

To absorb HCl gas

c)

To absorb moisture from HCl gas

d)

To Use it as a catalyst

17.

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

18.

When copper oxide and dilute hydrochloric acid react, colour changes to

a)

white

b)

bluish-green

c)

blue-black

d)

black

19.

Which one of the given is a mineral acid?

a)

Lactic acid

b)

Formic acid

c)

Tartaric acid

d)

Hydrochloric acid

20.

Acid present in apple is :

a)

Oxalic acid

b)

Malic acid

c)

Acetic acid

d)

Formic acid

21.

The chemical formula of Plaster of Paris is

a)

CaSO₄,1/2H₂O

b)

CaSO₄, 2H₂O

c)

CaSO₄, H₂O

d)

CaSO₄, 3H₂O

22.

When acids dissolve in water it releases _____.

a)

H+ ion

b)

H- ion

c)

H3O+ ion

d)

H3O2+ ion

23.

Methyl orange is

a)

Pink in acidic medium, yellow in basic medium

b)

Yellow in acidic medium, pink in basic medium

c)

Colourless in acidic medium, pink in basic medium

d)

Pink in acidic medium, colorless in basic medium

24.

The pH of commonly used toothpaste is

a)

<6.5

b)

≥7.0

c)

≥2.2

d)

None of these

25.

Sodium hydroxide is used

a)

as an antacid

b)

in manufacture of soap

c)

as a cleansing agent

d)

in alkaline batteries

26.

Chemical formula of washing soda is

a)

Na2C03 . 7H2O

b)

Na2C03 . 5H2O

c)

Na2C03 . 2H2O

d)

Na2C03 . 10H2O

27.

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

a)

Acid

b)

Base

c)

Water

d)

All of the above

28.

Which of the following gives the correct increasing order of acidic strength?

a)

Water < Acetic acid < Hydrochloric acid

b)

Water < Hydrochloric acid < Acetic acid

c)

Acetic acid < Water < Hydrochloric acid

d)

Hydrochloric acid < Water < Acetic acid

29.

The function of quick lime in soda lime mixture is to

a)

Absorb moisture present in soda lime

b)

Increase the efficiency of soda lime

c)

Increase the pH of soda lime

d)

Take part in reaction with NaOH

30.

The pH of Gastric juice is

a)

<6.5

b)

≥7.0

c)

1.5 to 3.5

d)

None of these

31.

Acids react with metals to liberate _________gas

a)

Carbon dioxide

b)

Carbon monoxide

c)

Hydrogen

d)

Water

32.

Most of the oxides of metals when react with acid, form____

a)

A base

b)

An acid

c)

A salt

d)

Either (1) or (2)

33.

Acids react with metal carbonates to liberate ______ gas

a)

Carbon dioxide

b)

Carbon monoxide

c)

Hydrogen

d)

Water

34.

Which one of the given is an organic acid?

a)

Citric acid

b)

Hydrochloric acid

c)

Lactic acid

d)

Both (1) & (3)

35.

Which one of the given is the pH value of pure water?

a)

0

b)

7

c)

8

d)

1

36.

Generally, when certain metals react with an acid they release _______ gas.

a)

Nitrogen

b)

Oxygen

c)

Hydrogen

d)

Argon

37.

Which one of the given is incorrect?

a)

Acids turns blue litmus paper red

b)

Aqueous solutions of acids conduct electricity

c)

Acids react with certain metals to form hydrogen gas

d)

None of these

38.

Lime water turns milky when carbon dioxide is passed due to the formation of ______.

a)

CaCO3

b)

CaO

c)

CO2

d)

CaSO4

39.

Which of the following salts has no water of crystallization?

a)

Blue vitriol

b)

Washing soda

c)

Baking soda

d)

Gypsum

40.

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 Carbonate, Carbon dioxide

b)

Calcium chloride, carbon dioxide

c)

Calcium oxide, hydrogen

d)

Calcium carbonate, hydrogen

41.

Acids react with bases to form salt and water. This reaction is known as:

a)

Combination

b)

Decomposition

c)

Neutralisation

d)

reduction

42.

Rain is called acid rain when its:

a)

pH falls below 7

b)

pH falls below 6

c)

pH falls below 5.6

d)

pH is above 7

43.

Which of the given is a strong base?

a)

Calcium hydroxide

b)

Magnesium hydroxide

c)

Ammonium hydroxide

d)

Potassium hydroxide

44.

How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

a)

Increases

b)

Decreases

c)

Remains the same

d)

Becomes zero

45.

Farmers neutralise the effect of acidity of the soil by adding

a)

slaked lime

b)

gypsum

c)

caustic soda

d)

baking soda

46.

Lime water reacts with chlorine to give

a)

bleaching powder

b)

baking powder

c)

baking soda

d)

washing soda

47.

The milkiness (on passing excess carbon dioxide gas through lime water) disappears due to the formation of:

a)

Calcium carbonate CaCO3

b)

Calcium hydrogen carbonate CaHCO3

c)

Calcium oxide CaO

d)

Calcium Nitrate Ca(NO3)2

48.

Black ash is

a)

Dry KOH

b)

Barium sulphide

c)

Charcoal

d)

Hydrated KOH

49.

Nettle sting is a natural source of which acid?

a)

Methanoic acid

b)

Lactic acid

c)

Citric acid

d)

Tartaric acid

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 with saline solution.

b)

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.

c)

After washing with plenty of water and apply solution of sodium hydroxide on the hand.

d)

Neutralise the acid with a strong alkali.

51.

Sodium carbonate is a basic salt because it is a salt of

a)

strong acid and strong base

b)

weak acid and weak base

c)

strong acid and weak base

d)

weak acid and strong base

52.

Increase in the OH- ion concentration, leads to

a)

an increases in the pH of solution

b)

a decrease in the pH of the solution

c)

doesn't alter the pH of the solution

d)

decreases the basic strength of the solution

53.

A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for identification?

a)

Blue litmus

b)

Red litmus

c)

Sodium carbonate solution

d)

Dilute hydrochloric acid

54.

The pH of a solution is 7. How can you increase its pH?

a)

By adding a small amount of acid

b)

By adding a small amount of base.

c)

By adding a small amount of salt.

d)

By passing carbon dioxide gas through it

55.

What is the pH range of our body?

a)

7.0 - 7.8

b)

7.2 - 8.0

c)

7.0 - 8.4

d)

7.2 - 8.4

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