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Answer 4
The reason for the first option-
All alkali metal( Na, K, etc.) dissolves in liquid ammonia giving deep blue solutions which are conducting in nature. These solutions contain ammoniated cations and ammoniated electrons as shown below:
M + ( x + y ) NH3 → M+(NH3 )x + e-(NH3)y
The blue colour of the solution is considered to be due to ammoniated electrons which absorb energy corresponding to the red region of the visible light
For 2nd and 4th -
The solution are paramagnetic and in the presence Of impurities
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