question_answer

\[A{{l}_{2}}{{O}_{3}}\] can be converted to anhydrous \[AlC{{l}_{3}}\] by heating:                     [AIPMT (S) 2006]

A) \[A{{l}_{2}}{{O}_{3}}\] with HCl gas

B) \[A{{l}_{2}}{{O}_{3}}\] with \[NaCl\] in solid state

C) a mixture of \[A{{l}_{2}}{{O}_{3}}\] and carbon in dry \[C{{l}_{2}}\] gas

D) \[A{{l}_{2}}{{O}_{3}}\] with \[C{{l}_{2}}\] gas

Correct Answer: C

Solution :

[c]  may be converted to anyhydrous  by heating of mixture of Al2O3 and carbon in dry chlorine Note:    Anhydrous  exists in form of dimer as