First slide

Uses of Boron & Aluminium

Question

Which of the following substance sublimes on heating

Moderate

A

AlF₃
B

AlCl₃
C

AlBr₃
D

AlI₃

Solution

$\mathop {2AlC{l_3}}\limits_{monomer} \rightleftharpoons \,\mathop {\mathop {A{l_2}C{l_6}_{(s)}}\limits_{\dim er} }\limits_{white\,\,solid\,} \xrightarrow[{Sub\lim ation}]{{{{180}^0}c}}A{l_2}C{l_6}_{(g)}\xrightarrow{{{{400}^o}c}}\mathop {2AlC{l_3}}\limits_{monomer}$
Al₂Cl₆ solid sublimes at 180^oc

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