Question

Assertion: Rusting of Fe is quicker in saline water than in ordinary water.
Reason: Presence of $N{a}^{+}$ and $C{l}^{-}$ ions increase the conductance of the saline water.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false

Answer 1

Answer: (A)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

The $N{a}^{\oplus }$ and $C{l}^{\ominus }$ present in saline water increase the conductance of the solution in contact with the metal surface. This accelerates the formation of $F{e}^{2+}$ ions and hence that of rust, $F{e}_2{O}_3\cdot x{H}_{2}O$