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Choose the correct answer form the alternatives given. When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals. Which of the following observations regarding the reaction are correct? (i) Dilute solution are bright blue in colour due to solvated electrons. (ii) These solutions decompose to form amides and hydrogen. (iii) From this solution the ammoniates \( \left[M\left(N H_{3}\right)_{6}\right]^{2+} \) can be recovered by evaporation

1. only (i) and (ii)
2. Only (i) and (ii) and (iii)
3. only (ii) and (iii)
4. only (i)

Correct answer: Only (i) and (ii) and (iii)

Solution

All three statements match the known behavior of alkaline earth metals in liquid ammonia: dilute solutions are blue because of solvated electrons, they can decompose to amides and hydrogen, and the hexammine ammoniates can be obtained by evaporation. Therefore, the correct choice includes (i), (ii), and (iii).

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