7. Hydrated halides of Be and Mg suffer hydrolysis on heating

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Solution

Hydrated halides of Be and Mg suffer hydrolysis on heating
The hydrated halide of magnesium is $M g C l_{2} .6 H_{2} O$ , on heating, it decomposes to magnesium oxide, hydrochloric acid, and water.
$M g C l_{2} .6 H_{2} O (s) Δ - ----- \to M g O (s) + 2 H C l (g) + 5 H_{2} O (l)$
The hydrated halide of beryllium is $B e C l_{2} .4 H_{2} O$ on heating, it decomposes to beryllium chloride hydroxide, hydrochloric acid, and water.
$B e C l_{2} .4 H_{2} O (s) Δ - ----- \to B e C l (O H) (s) + H C l (g) + 3 H_{2} O (l)$

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