Question

Assertion (A): On adding sulphuric acid to water the resulting aqueous
solution gets corrosive Reason (R): Hydroxyl ions are responsible for
corrosive action

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct
explanation of Assertion (A)

(b) Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct
explanation of Assertion (A)

(c) Assertion (A) is true but Reason (R) is false

(d) Assertion (A) is false but Reason (R) is true

(e) Both Assertion (A) and Reason (R) are false​

Answer 1

Answer:(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Explanation:

H2SO4 is a strong acid, it readily forms hydronium ions when dissolved in water which are responsible for its corrosive action.

Answer 2

Both Assertion (A) and Reason (R) are false, therefore the correct option is (e).

• When we add Sulphuric acid to water, the resulting aqueous solution gets diluted. The diluted sulphuric acid is less corrosive and does not cause any damage to the instrument.
• When Sulphuric acid is dissolved in water, then sulphuric acid dissociates into Hydronium ions and Sulphate ions. These hydronium ions are responsible for their acidic nature. These hydronium ions are responsible for the corrosive nature of acid.
• Therefore, on adding sulphuric acid to water the acid gets diluted and hence the corrosive nature decreases, and the hydronium ions are responsible for the corrosive action, hence both assertion and reason are false.