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(D) $1$. Alkali metals dissolve in liquid $NH_3$ to form a deep blue solution,which is conducting and paramagnetic due to the presence of ammoniated e

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The blue colour of alkali metal in liquid $NH_3$ solution is due to the absorption of orange radiation.

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(D) $1$. Alkali metals dissolve in liquid $NH_3$ to form a deep blue solution,which is conducting and paramagnetic due to the presence of ammoniated electrons $(e^-(NH_3)_x)$.$2$. The blue colour is due to the absorption of light in the red region of the visible spectrum,which corresponds to the excitation of ammoniated electrons.$3$. As the concentration of the metal increases,the blue colour changes to bronze and the solution becomes diamagnetic because the ammoniated electrons pair up to form clusters.$4$. Therefore,the paramagnetic character decreases with increasing concentration.$5$. On standing,the blue solution slowly decomposes to form metal amide $(MNH_2)$ and hydrogen gas $(H_2)$,but this is not a property of all alkali metals under all conditions immediately.

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