Chapter 2 · Acids, Bases and Salts

NCERT Exemplar Class 10 Science Chapter 2 Multiple Choice Questions

All 30 questions of NCERT Exemplar Class 10 Science Chapter 2 Multiple Choice Questions (Acids, Bases and Salts), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   What happens ​when a ​solution of an acid is mixed with a solution of a ​base in a test tube?

   1. (i)The temperature of the solution increases
   2. (ii)The temperature ​of the ​solution ​decreases
   3. (iii)The temperature of the solution remains ​the same
   4. (iv)Salt formation takes place

   1. (a)(i) only
   2. (b)(i) and (iii)
   3. (c)(ii) and (iii)
   4. (d)(i) and (iv)
   Show answer

   (d) (i) and (iv)

   Step-by-step solution →
2. Q2
   An ​aqueous ​solution turns red litmus ​solution blue. Excess addition of ​which of the following ​solution ​would ​reverse the change?

   1. (a)Baking powder
   2. (b)Lime
   3. (c)Ammonium hydroxide solution
   4. (d)Hydrochloric acid
   Show answer

   (d) Hydrochloric acid

   Step-by-step solution →
3. Q3
   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

   1. (a)absorb the evolved gas
   2. (b)moisten the gas
   3. (c)absorb moisture from the gas
   4. (d)absorb ${\text{Cl}}^{-}$ ions from the evolved gas
   Show answer

   (c) absorb moisture from the gas

   Step-by-step solution →
4. Q4
   Which of ​the following salts does ​not ​contain ​water of ​crystallisation?

   1. (a)Blue vitriol
   2. (b)Baking soda
   3. (c)Washing soda
   4. (d)Gypsum
   Show answer

   (b) Baking soda

   Step-by-step solution →
5. Q5
   Sodium carbonate ​is a ​basic salt ​because it ​is a salt ​of

   1. (a)strong acid and strong base
   2. (b)weak acid and weak base
   3. (c)strong acid and weak base
   4. (d)weak acid and strong base
   Show answer

   (d) weak acid and strong base

   Step-by-step solution →
6. Q6
   Calcium ​phosphate is ​present in tooth ​enamel. ​Its ​nature ​is

   1. (a)basic
   2. (b)acidic
   3. (c)neutral
   4. (d)amphoteric
   Show answer

   (a) basic

   Step-by-step solution →
7. Q7
   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

   Step-by-step solution →
8. Q8
   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

   Step-by-step solution →
9. Q9
   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

   Step-by-step solution →
10. Q10
    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)

    Step-by-step solution →
11. Q11
    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)

    Step-by-step solution →
12. Q12
    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

    Step-by-step solution →
13. Q13
    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

    Step-by-step solution →
14. Q14
    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)

    Step-by-step solution →
15. Q15
    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

    Step-by-step solution →
16. Q16
    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)

    Step-by-step solution →
17. Q17
    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

    Step-by-step solution →
18. Q18
    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

    Step-by-step solution →
19. Q19
    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

    Step-by-step solution →
20. Q20
    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 $\text{NaOH}$ ​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

    1. (a)(i) and (iii)
    2. (b)(ii) and (iv)
    3. (c)(ii) only
    4. (d)(iv) only
    Show answer

    (c) (ii) only

    Step-by-step solution →
21. Q21
    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

    Step-by-step solution →
22. Q22
    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

    Step-by-step solution →
23. Q23
    Which among ​the ​following is ​not a ​base?

    1. (a)$\text{NaOH}$
    2. (b)$\text{KOH}$
    3. (c)${\text{NH}}_4\text{OH}$
    4. (d)${\text{C}}_2{\text{H}}_5\text{OH}$
    Show answer

    (d) ${\text{C}}_2{\text{H}}_5\text{OH}$

    Step-by-step solution →
24. Q24
    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

    Step-by-step solution →
25. Q25
    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 ${\text{H}}_2$ and ${\text{Cl}}_2$
    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)

    Step-by-step solution →
26. Q26
    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

    1. (a)Red
    2. (b)Yellow
    3. (c)Yellowish green
    4. (d)Blue
    Show answer

    (c) Yellowish green

    Step-by-step solution →
27. Q27
    Which of the following is(are) true when $\text{HCl}(g)$ is passed through water?

    1. (i)It does not ionise in the solution as it is a covalent ​compound.
    2. (ii)It ionises in the solution
    3. (iii)It gives ​both hydrogen ​and hydroxyl ion in the solution
    4. (iv)It forms hydronium ion in the ​solution due to the ​combination of hydrogen ion ​with water molecule

    1. (a)(i) only
    2. (b)(iii) only
    3. (c)(ii) and (iv)
    4. (d)(iii) and (iv)
    Show answer

    (c) (ii) and (iv)

    Step-by-step solution →
28. Q28
    Which ​of the ​following statements ​is ​true ​for ​acids?

    1. (a)Bitter and change red litmus to blue
    2. (b)Sour and change red litmus to blue
    3. (c)Sour and change blue litmus to red
    4. (d)Bitter and change blue litmus to red
    Show answer

    (c) Sour and change blue litmus to red

    Step-by-step solution →
29. Q29
    Which ​of ​the ​following ​are present in ​a dilute aqueous ​solution ​of ​hydrochloric acid?

    1. (a)${\text{H}}_3{\text{O}}^{+}+{\text{Cl}}^{-}$
    2. (b)${\text{H}}_3{\text{O}}^{+}+{\text{OH}}^{-}$
    3. (c)${\text{Cl}}^{-}+{\text{OH}}^{-}$
    4. (d)unionised $\text{HCl}$
    Show answer

    (a) ${\text{H}}_3{\text{O}}^{+}+{\text{Cl}}^{-}$

    Step-by-step solution →
30. Q30
    Identify the correct representation ​of reaction ​occurring ​during chloralkali ​process

    1. (a)$2\text{NaCl}(l)+2{\text{H}}_2\text{O}(l)\to 2\text{NaOH}(l)+{\text{Cl}}_2(g)+{\text{H}}_2(g)$
    2. (b)$2\text{NaCl}(aq)+2{\text{H}}_2\text{O}(aq)\to 2\text{NaOH}(aq)+{\text{Cl}}_2(g)+{\text{H}}_2(g)$
    3. (c)$2\text{NaCl}(aq)+2{\text{H}}_2\text{O}(l)\to 2\text{NaOH}(aq)+{\text{Cl}}_2(aq)+{\text{H}}_2(aq)$
    4. (d)$2\text{NaCl}(aq)+2{\text{H}}_2\text{O}(l)\to 2\text{NaOH}(aq)+{\text{Cl}}_2(g)+{\text{H}}_2(g)$
    Show answer

    (d) $2\text{NaCl}(aq)+2{\text{H}}_2\text{O}(l)\to 2\text{NaOH}(aq)+{\text{Cl}}_2(g)+{\text{H}}_2(g)$

    Step-by-step solution →