Molten mixture of \( \mathrm{NaCl} \) and \( \mathrm{CaCl}_{2} \) is added to the heated \( \mat...

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Molten mixture of \( \mathrm{NaCl} \) and \( \mathrm{CaCl}_{2} \) is added to the heated \( \mathrm{MgCl}_{2} \) because:
(a) \( \mathrm{MgCl}_{2} \cdot x \mathrm{H}_{2} \mathrm{O}+\operatorname{dry~HCl} \stackrel{973-1223 \mathrm{~K}}{\longrightarrow} \) Partially dehydrated \( \mathrm{MgCl}_{2} \) and molten mixture \( \left(\mathrm{NaCl}+\mathrm{CaCl}_{2}\right) \) makes it fully dehydrated
(b) \( \mathrm{CaCl}_{2} \) is dehydrating agent
(c) \( \left(\mathrm{CaCl}_{2}+\mathrm{NaCl}\right) \) lowers the melting point of \( \mathrm{MgCl}_{2} \)
(d) None of these
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