Question

Assertion :Alkali metals dissolves in liquid ammonia to give blue solution Reason: Alkali metals in liquid ammonia give solvated species of the type $\left[M\right(N{H}_3{)}_n{]}^{+}$( $M=$ alkali metals).

• A. Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion
• B. Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion
• C. The Assertion is correct but the Reason is incorrect
• D. The Assertion is incorrect but the Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

Alkali metals dissolve in liquid ammonia to give a blue solution. Alkali metals in liquid ammonia give solvated species of the type $\left[M\right(N{H}_3{)}_n{]}^{+}$( $M=$ alkali metals).Both these statements are correct and the reason is not the correct explanation for the assertion.
Alkali metals on dissolving in liq. ammonia forms ammoniated metal ion and ammoniated electron. the blue colour of the solution is due to ammoniated electrons and conductivity due to both ammoniated metal ion and ammoniated electron.
$M\left(s\right)+N{H}_3\left(l\right)\to M(N{H}_3{)}_x+e(N{H}_3{)}_y$
Hence option B is correct.