Class 10 Science · Chapter 2

Acids, Bases and Salts

208 Class 10 Science questions on Acids, Bases and Salts from the NCERT textbook, NCERT Exemplar and CBSE board papers 2024–2026, each with its answer and a step-by-step solution.

NCERT exercises

Exercises (15) Intext Questions (Page 18) (1) Intext Questions (Page 22) (3) Intext Questions (Page 25) (6) Intext Questions (Page 28) (4) Intext Questions (Page 33) (5)

NCERT Exemplar exercises

Multiple Choice Questions (30) Short Answer Questions (12) Long Answer Questions (6)

CBSE Class 10 Science previous year papers, with answers →

Questions · page 3 of 11

Q41 Exemplar · Multiple Choice Questions
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?
1. (a)Lemon juice
2. (b)Vinegar
3. (c)Common salt
4. (d)An antacid
Show answer

(d) An antacid

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Q42 Exemplar · Multiple Choice Questions
Which of the following gives the correct increasing order of acidic strength?
1. (a)Water $<$ Acetic acid $<$ Hydrochloric acid
2. (b)Water $<$ Hydrochloric acid $<$ Acetic acid
3. (c)Acetic acid $<$ Water $<$ Hydrochloric acid
4. (d)Hydrochloric acid $<$ Water $<$ Acetic acid
Show answer

(a) Water $<$ Acetic acid $<$ Hydrochloric acid

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Q43 Exemplar · Multiple Choice Questions
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
1. (a)Wash the hand with saline solution
2. (b)Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate
3. (c)After washing with plenty of water apply solution of sodium hydroxide on the hand
4. (d)Neutralise the acid with a strong alkali
Show answer

(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate

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Q44 Exemplar · Multiple Choice Questions
Sodium hydrogencarbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
1. (i)It turns lime water milky
2. (ii)It extinguishes a burning splinter
3. (iii)It dissolves in a solution of sodium hydroxide
4. (iv)It has a pungent odour
1. (a)(i) and (ii)
2. (b)(i), (ii) and (iii)
3. (c)(ii), (iii) and (iv)
4. (d)(i) and (iv)
Show answer

(b) (i), (ii) and (iii)

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Q45 Exemplar · Multiple Choice Questions
Common salt besides being used in kitchen can also be used as the raw material for making
1. (i)washing soda
2. (ii)bleaching powder
3. (iii)baking soda
4. (iv)slaked lime
1. (a)(i) and (ii)
2. (b)(i), (ii) and (iv)
3. (c)(i) and (iii)
4. (d)(i), (iii) and (iv)
Show answer

(c) (i) and (iii)

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Q46 Exemplar · Multiple Choice Questions
One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is
1. (a)hydrochloric acid
2. (b)tartaric acid
3. (c)acetic acid
4. (d)sulphuric acid
Show answer

(b) tartaric acid

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Q47 Exemplar · Multiple Choice Questions
To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
1. (a)acidic
2. (b)neutral
3. (c)basic
4. (d)corrosive
Show answer

(c) basic

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Q48 Exemplar · Multiple Choice Questions
Which of the following statements is correct about an aqueous solution of an acid and of a base?
1. (i)Higher the pH, stronger the acid
2. (ii)Higher the pH, weaker the acid
3. (iii)Lower the pH, stronger the base
4. (iv)Lower the pH, weaker the base
1. (a)(i) and (iii)
2. (b)(ii) and (iii)
3. (c)(i) and (iv)
4. (d)(ii) and (iv)
Show answer

(d) (ii) and (iv)

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Q49 Exemplar · Multiple Choice Questions
The pH of the gastric juices released during digestion is
1. (a)less than 7
2. (b)more than 7
3. (c)equal to 7
4. (d)equal to 0
Show answer

(a) less than 7

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Q50 Exemplar · Multiple Choice Questions
Which of the following phenomena occur, when a small amount of acid is added to water?
1. (i)Ionisation
2. (ii)Neutralisation
3. (iii)Dilution
4. (iv)Salt formation
1. (a)(i) and (ii)
2. (b)(i) and (iii)
3. (c)(ii) and (iii)
4. (d)(ii) and (iv)
Show answer

(b) (i) and (iii)

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Q51 Exemplar · Multiple Choice Questions
Which one of the following can be used as an acid-base indicator by a visually impared student?
1. (a)Litmus
2. (b)Turmeric
3. (c)Vanilla essence
4. (d)Petunia leaves
Show answer

(c) Vanilla essence

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Q52 Exemplar · Multiple Choice Questions
Which of the following substance will not give carbon dioxide on treatment with dilute acid?
1. (a)Marble
2. (b)Limestone
3. (c)Baking soda
4. (d)Lime
Show answer

(d) Lime

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Q53 Exemplar · Multiple Choice Questions
Which of the following is acidic in nature?
1. (a)Lime juice
2. (b)Human blood
3. (c)Lime water
4. (d)Antacid
Show answer

(a) Lime juice

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Q54 Exemplar · Multiple Choice Questions
In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Figure 2.1) was set up. Which among the following statement(s) is(are) correct?
1. (i)Bulb will not glow because electrolyte is not acidic
2. (ii)Bulb will glow because $NaOH$ is a strong base and furnishes ions for conduction.
3. (iii)Bulb will not glow because circuit is incomplete
4. (iv)Bulb will not glow because it depends upon the type of electrolytic solution
Figure 2.1 — apparatus for demonstrating electrical conductivity through an electrolyte
1. (a)(i) and (iii)
2. (b)(ii) and (iv)
3. (c)(ii) only
4. (d)(iv) only
Show answer

(c) (ii) only

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Q55 Exemplar · Multiple Choice Questions
Which of the following is used for dissolution of gold?
1. (a)Hydrochloric acid
2. (b)Sulphuric acid
3. (c)Nitric acid
4. (d)Aqua regia
Show answer

(d) Aqua regia

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Q56 Exemplar · Multiple Choice Questions
Which of the following is not a mineral acid?
1. (a)Hydrochloric acid
2. (b)Citric acid
3. (c)Sulphuric acid
4. (d)Nitric acid
Show answer

(b) Citric acid

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Q57 Exemplar · Multiple Choice Questions
Which among the following is not a base?
1. (a) $NaOH$
2. (b) $KOH$
3. (c) $NH_{4} OH$
4. (d) $C_{2} H_{5} OH$
Show answer

(d) $C_{2} H_{5} OH$

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Q58 Exemplar · Multiple Choice Questions
Which of the following statements is not correct?
1. (a)All metal carbonates react with acid to give a salt, water and carbon dioxide
2. (b)All metal oxides react with water to give salt and acid
3. (c)Some metals react with acids to give salt and hydrogen
4. (d)Some non metal oxides react with water to form an acid
Show answer

(b) All metal oxides react with water to give salt and acid

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Q59 Exemplar · Multiple Choice Questions
Match the chemical substances given in Column (A) with their appropriate application given in Column (B) Column (A): (A) Bleaching powder (B) Baking soda (C) Washing soda (D) Sodium chloride Column (B):
1. (i)Preparation of glass
2. (ii)Production of $H_{2}$ and $Cl_{2}$
3. (iii)Decolourisation
4. (iv)Antacid
1. (a)(A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)
2. (b)(A)-(iii), (B)-(ii), (C)-(iv), (D)-(i)
3. (c)(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
4. (d)(A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
Show answer

(c) (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

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Q60 Exemplar · Multiple Choice Questions
Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in Figure 2.2
Figure 2.2 — colour guide for pH paper
1. (a)Red
2. (b)Yellow
3. (c)Yellowish green
4. (d)Blue
Show answer

(c) Yellowish green

Step-by-step solution →