Answer:
The formula of the hydrated salt is \[MgC{{l}_{2}}.6{{H}_{2}}O\]. When heated, it gets hydrolysed to form MgO.
\[MgC{{l}_{2}}.6{{H}_{2}}O\xrightarrow{Heat}\,MgO+2HCl+5{{H}_{2}}O\]
Therefore, the salt cannot be dehydrated by heating as such. The dehydration is done by passing \[HCl\] gas through the hydrated salt at about 650 K.
\[MgC{{l}_{2}}.6{{H}_{2}}O\xrightarrow[650K]{HCl(g)}\underset{\text{(Anthydrous)}}{\mathop{MgC{{l}_{2}}}}\,+6{{H}_{2}}O\]
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