Which of the following equations are correct

1.	Which of the following equations are correct
Answer» `MgCl_(2)2H_(2)O overset(Delta)(to) Mg(OH)_(2)+2HCL` `MgCl_(2)6H_(2)O overset(Delta)(to) MgCl_(2)2H_(2)O+4H_(2)O` `MgO+C+Cl_(2) to MgCl_(2)+CO` `MgSO_(4)7H_(2)Ooverset(100K)(to)MgSO_(4)` Solution :`MgSO_(4).7H_(2)Ooverset(423K)underset(-6H_(2)O)(to)MgSO_(4).H_(2)O`

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