Assertion(A) : On reaction with liquid ammonia, alkali metals give conducting solution
Reason(R) : Ammoniated $e^{-}$ and ammoniated cations are formed when alkali metals is present in liquid ammonia.

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Both A and R are but R is not the correct explanation of A

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answer is A.

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Detailed Solution

All alkali metals dissolve in liquid ammonia and give deep blue colour solution which are conducting in nature. These solutions contain ammoniated cation and ammoniated electrons
$M + (x + y) N H_{3} \to {[M {(N H_{3})}_{x}]}^{+} + {[e {(N H_{3})}_{y}]}^{-}$
The electrical conductivity of the solution is due to both ammoniated cations and ammoniated electrons.