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Why hydrated chlorides of Ca, Sr and Ba ...

Why hydrated chlorides of Ca, Sr and Ba can be dehydrated by heating while those of Be and Mg suffer hydrolysis?

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`CaCl_(2).6H_(2)O overset("Heat")toCaCl_(2)+6H_(2)O`
`MgCl_(2).6H_(2)O overset("heat")toMgO+2HCl+5H_(2)O`
`MgCl_(2).6H_(2)O` or `BeCl_(2).4H_(2)O` on heating suffer hydrolysis due to the high affinity towards hydrolysis.
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