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BeCl2 fumes in moist air but BaCl4 does ...

`BeCl_2` fumes in moist air but `BaCl_4` does not. Explain.

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`BeCl_2` being a salt of a weak base, `Be(OH)_2` and a strong acid, HCI undergoes hydrolysis in moist air to form HCl which fumes in air. `BaCl_2` on the other hand, being a salt of a strong base, `Ba(OH)_2` and strong acid, HCl does not undergo hydrolysis to form HCl and hence does not fume in moist air.
`BeCl_2 + 2H_2O to Be(OH)_2 + 2HCl uarr`
`BaCl_2 + H_2O to Ba(OH)_2 + 2HCl`
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