Question

Which of the following changes is not realised in the laboratory?

• A. Absorption of NO by alkaline sodium sulphite to form a compound.
• B. Combustion of metallic Mg in $C{O}_2$.
• C. Heating hydrated magnesium chloride to get the anhydrous salt.
• D. 'Displacement' of chlorine from $KCI{O}_3$ by iodine to from $KI{O}_3$.

Answer 1

Answer: (C)

Heating hydrated magnesium chloride to get the anhydrous salt.

On heating $MgC{l}_2.6H_{2}O$, it gets hydrolysed by its own water of crysatallization to an oxy chlorides.

$MgC{l}_2.6H_{2}O\stackrel{\Delta }{\to }MgO+2Hcl+5H_{2}O$