Class 10 Science · Chapter 2

Acids, Bases and Salts

352 Class 10 Science questions on Acids, Bases and Salts from the NCERT textbook, NCERT Exemplar and CBSE board papers 2018–2026, each with its answer and a step-by-step solution.

CBSE Class 10 Science previous year papers, with answers →

Questions · page 13 of 18

1. Q241 CBSE 2023
   Select ​the ​correct option(s) ​in ​the ​following ​table ​:

   Natural sources and the acid listed against each

   Option	Natural Sources	Acid present
   (i)	Tamarind	Tartaric acid
   (ii)	Tomato	Acetic acid
   (iii)	Ant sting	Oxalic acid
   (iv)	Nettle sting	Methanoic acid

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

   (c) (i) and (iv)

   Step-by-step solution →
2. Q242 CBSE 2023
   A solution ​turns ​the colour of turmeric to reddish brown. ​If ​the same solution is poured on ​universal indicator, its colour would ​change to ​–

   1. (a)violet
   2. (b)blue
   3. (c)red
   4. (d)green
   Show answer

   (b) blue

   Step-by-step solution →
3. Q243 CBSE 2023
   Select ​the ​correct ​statement ​from ​the following :

   1. (a)${\text{CO}}_2$ is a product of respiration whereas $\text{CO}$ is a product of photosynthesis.
   2. (b)${\text{CO}}_2$ is a product of respiration whereas ${\text{Cl}}_2$ is a product of chlor-alkali process.
   3. (c)${\text{CO}}_2$ is a product of photosynthesis whereas ${\text{H}}_2$ is a product of chlor-alkali process.
   4. (d)${\text{CO}}_2$ is a product of incomplete combustion whereas $\text{CO}$ is a product of respiration.
   Show answer

   (b) ${\text{CO}}_2$ is a product of respiration whereas ${\text{Cl}}_2$ is a product of chlor-alkali process.

   Step-by-step solution →
4. Q244 CBSE 2023
   Select ​from ​the following compounds ​which ​is not ​a ​base :

   1. (a)Sodium hydroxide
   2. (b)Calcium hydroxide
   3. (c)Sodium sulphate
   4. (d)Zinc oxide
   Show answer

   (c) Sodium sulphate

   Step-by-step solution →
5. Q245 CBSE 2023
   Which of the ​following will ​allow the electricity ​to flow through it/them ?

   1. (i)Glucose
   2. (ii)Dry HCl ​gas
   3. (iii)​Alcohol
   4. (iv)​Dil. ${\text{H}}_2{\text{SO}}_4$

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

   (b) (iv) only

   Step-by-step solution →
6. Q246 CBSE 2023
   The ​table ​below ​has information ​regarding pH and the nature (acidic/basic) of four different solutions. ​Which ​one of the options in the table is ​correct ?

   pH paper colour, approximate pH and nature of four solutions

   Option	Solution	Colour of pH paper	Approximate pH value	Nature of solution
   (a)	Lemon juice	Orange	3	Basic
   (b)	Milk of magnesia	Blue	10	Basic
   (c)	Gastric juice	Red	6	Acidic
   (d)	Pure water	Yellow	7	Neutral

   1. (a)Lemon juice: pH paper orange, approximate pH $3$, nature basic
   2. (b)Milk of magnesia: pH paper blue, approximate pH $10$, nature basic
   3. (c)Gastric juice: pH paper red, approximate pH $6$, nature acidic
   4. (d)Pure water: pH paper yellow, approximate pH $7$, nature neutral
   Show answer

   (b) Milk of magnesia: pH paper blue, approximate pH $10$, nature basic

   Step-by-step solution →
7. Q247 CBSE 2023
   When ​zinc ​reacts ​with ​sodium ​hydroxide, the ​product ​formed is :

   1. (a)Sodium oxide
   2. (b)Sodium zincate
   3. (c)Zinc hydroxide
   4. (d)Zinc oxide
   Show answer

   (b) Sodium zincate

   Step-by-step solution →
8. Q248 CBSE 2023
   Acid present in tomato is :

   1. (a)Methanoic acid
   2. (b)Acetic acid
   3. (c)Lactic acid
   4. (d)Oxalic acid
   Show answer

   (d) Oxalic acid

   Step-by-step solution →
9. Q249 CBSE 2023
   Fresh milk has a pH of ​6. ​To delay ​its curdling, ​a chemical ​substance ​is ​added to it, ​which is :

   1. (a)Sodium carbonate
   2. (b)Baking powder
   3. (c)Sodium hydroxide (Caustic soda)
   4. (d)Baking soda (Sodium hydrogen carbonate)
   Show answer

   (d) Baking soda (Sodium hydrogen carbonate)

   Step-by-step solution →
10. Q250 CBSE 2023
    Two salts 'X' and ​'Y' are dissolved in ​water ​separately. When phenolphthalein is added to these two solutions, the solution 'X' ​turns ​pink and the solution 'Y' does ​not show ​any change in colour, therefore 'X' ​and 'Y' are

    Pairs of salts offered for X and Y

    Option	(X)	(Y)
    (a)	Na2CO3	NH4Cl
    (b)	Na2SO4	NaHCO3
    (c)	NH4Cl	Na2SO4
    (d)	NaNO3	Na2SO4

    1. (a)X is ${\text{Na}}_2{\text{CO}}_3$ and Y is ${\text{NH}}_4\text{Cl}$
    2. (b)X is ${\text{Na}}_2{\text{SO}}_4$ and Y is ${\text{NaHCO}}_3$
    3. (c)X is ${\text{NH}}_4\text{Cl}$ and Y is ${\text{Na}}_2{\text{SO}}_4$
    4. (d)X is ${\text{NaNO}}_3$ and Y is ${\text{Na}}_2{\text{SO}}_4$
    Show answer

    (a) X is ${\text{Na}}_2{\text{CO}}_3$ and Y is ${\text{NH}}_4\text{Cl}$

    Step-by-step solution →
11. Q251 CBSE 2023
    Which of ​the ​following gives the ​correct ​increasing ​order of acidic strength ?

    1. (a)Sodium chloride $<$ Acetic acid $<$ Hydrochloric acid
    2. (b)Sodium chloride $<$ Hydrochloric acid $<$ Acetic acid
    3. (c)Acetic acid $<$ Sodium chloride $<$ Hydrochloric acid
    4. (d)Hydrochloric acid $<$ Sodium chloride $<$ Acetic acid
    Show answer

    (a) Sodium chloride $<$ Acetic acid $<$ Hydrochloric acid

    Step-by-step solution →
12. Q252 CBSE 2023
    There ​are four solutions A, B, C, ​and D ​with pH values ​as follows ​: Which solution(s) would liberate hydrogen gas with zinc ​?

    pH values of the four solutions

    Solution	A	B	C	D
    pH	2.0	7.0	8.0	12.0

    1. (a)A only
    2. (b)D only
    3. (c)A and D
    4. (d)B and C
    Show answer

    (c) A and D

    Step-by-step solution →
13. Q253 CBSE 2023
    Sodium ​hydroxide ​is ​termed ​an ​alkali while Ferric hydroxide is ​not because :

    1. (a)Sodium hydroxide is a strong base, while Ferric hydroxide is a weak base.
    2. (b)Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
    3. (c)Sodium hydroxide is a strong base while Ferric hydroxide is a strong acid.
    4. (d)Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of Sodium hydroxide in water is comparatively higher than that of Ferric hydroxide.
    Show answer

    (b) Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.

    Step-by-step solution →
14. Q254 CBSE 2023
    A compound X is used ​in the ​paper, soap and glass ​industries. ​It can ​be prepared from common salt. ​‘X’ ​is :

    1. (a)anhydrous sodium carbonate (${\text{Na}}_2{\text{CO}}_3$)
    2. (b)sodium carbonate decahydrate (${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$)
    3. (c)sodium hydrogen carbonate (${\text{NaHCO}}_3$)
    4. (d)sodium sulphate hemihydrate (${\text{Na}}_2{\text{SO}}_4\cdot \frac{1}{2}{\text{H}}_2\text{O}$)
    Show answer

    (b) sodium carbonate decahydrate (${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$)

    Step-by-step solution →
15. Q255 CBSE 2023
    Carbon ​dioxide ​gas ​is not ​produced ​when ​hydrochloric acid ​reacts with ​:

    1. (a)Limestone
    2. (b)Lime water
    3. (c)Baking Soda
    4. (d)Marble
    Show answer

    (b) Lime water

    Step-by-step solution →
16. Q256 CBSE 2023
    Select ​washing ​soda from the ​following ​:

    1. (a)${\text{NaHCO}}_3$
    2. (b)${\text{Na}}_2{\text{CO}}_3\cdot 5{\text{H}}_2\text{O}$
    3. (c)${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$
    4. (d)$\text{NaOH}$
    Show answer

    (c) ${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$

    Step-by-step solution →
17. Q257 CBSE 2023
    The ​name of the salt ​used to remove ​permanent ​hardness of ​water ​is :

    1. (a)Sodium hydrogen carbonate (${\text{NaHCO}}_3$)
    2. (b)Sodium chloride ($\text{NaCl}$)
    3. (c)Sodium carbonate decahydrate (${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$)
    4. (d)Calcium sulphate hemihydrate (${\text{CaSO}}_4\cdot \frac{1}{2}{\text{H}}_2\text{O}$)
    Show answer

    (c) Sodium carbonate decahydrate (${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$)

    Step-by-step solution →
18. Q258 CBSE 2023
    Hydronium ​ions are ​formed ​by the ​reaction between ​:

    1. (a)Sodium hydroxide and water
    2. (b)Calcium chloride and water
    3. (c)Hydrogen chloride gas and water
    4. (d)Ethanol and water
    Show answer

    (c) Hydrogen chloride gas and water

    Step-by-step solution →
19. Q259 CBSE 2023
    Select from the ​following, ​a salt whose aqueous solution ​will ​have ​pH ​less than ​seven.

    1. (a)Sodium chloride
    2. (b)Potassium sulphate
    3. (c)Sodium carbonate
    4. (d)Ammonium chloride
    Show answer

    (d) Ammonium chloride

    Step-by-step solution →
20. Q260 CBSE 2023
    Select the ​correct option ​from ​the ​following ​:

    Four salts with their parent acid, parent base and nature

    Option	Salt	Parent acid	Parent base	Nature of salt
    (a)	Sodium acetate	CH₃COOH	NaOH	Neutral
    (b)	Sodium carbonate	H₂CO₃	NaOH	Basic
    (c)	Sodium chloride	HCl	NaOH	Acidic
    (d)	Sodium nitrate	HNO₃	NaOH	Acidic

    1. (a)Sodium acetate — parent acid ${\text{CH}}_3\text{COOH}$, parent base $\text{NaOH}$, nature of salt: Neutral
    2. (b)Sodium carbonate — parent acid ${\text{H}}_2{\text{CO}}_3$, parent base $\text{NaOH}$, nature of salt: Basic
    3. (c)Sodium chloride — parent acid $\text{HCl}$, parent base $\text{NaOH}$, nature of salt: Acidic
    4. (d)Sodium nitrate — parent acid ${\text{HNO}}_3$, parent base $\text{NaOH}$, nature of salt: Acidic
    Show answer

    (b) Sodium carbonate — parent acid ${\text{H}}_2{\text{CO}}_3$, parent base $\text{NaOH}$, nature of salt: Basic

    Step-by-step solution →