Explanation

(b)
Alkali metals are highly reactive metals. They react with alcohol as
$2C_{2}H_{5}OH + 2K \rightarrow 2C_{2}H_{5}OK + H_{2}$
With water as
$2K + 2H_{2}O \rightarrow 2KOH + H_{2}$
With ammonia as
$K + (x + y){NH}_{3} \rightarrow \left\lbrack K\left( {NH}_{3} \right)_{x} \right\rbrack^{+} + \left\lbrack e\left( {NH}_{3} \right)_{y} \right\rbrack^{-}\ \$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ammoniated\ \ \ \ ammoniated\$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ cation\ \ \ \ \ \ \ \ \ \ \ \ \ electrons$