1(xi)
Assertion (A): Dilute Sulphuric acid is a stronger electrolyte than concentrated Sulphuric acid.
Reason (R): Dilute Sulphuric acid has a higher concentration of mobile ions.
- (a)(A) is true but (R) is false.
- (b)(A) is false but (R) is true.
- (c)Both (A) and (R) are true and (R) is the correct explanation of (A).
- (d)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
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Both (A) and (R) are true and (R) is the correct explanation of (A).
Reason — Dilute sulphuric acid is a stronger electrolyte because the presence of water causes greater ionisation, producing more mobile ions. Concentrated sulphuric acid contains comparatively fewer free ions, hence Assertion (A) is true.
The strength of an electrolyte depends on the concentration of mobile ions. In dilute sulphuric acid greater ionisation and ion mobility make it a better conductor of electricity, hence Reason (R) is true and is the correct explanation of (A).
H2SO4 ⟶ 2H+ + SO42-