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 :
\[A{{l}_{2}}{{O}_{3}}\] may be converted to anyhydrous \[AlC{{l}_{3}}\] by heating of mixture of \[A{{l}_{2}}{{O}_{3}}\] and carbon in dry chlorine \[A{{l}_{2}}{{O}_{3}}+3C+\underset{Hot\,and\,dry}{\mathop{3C{{l}_{2}}}}\,\xrightarrow[{}]{{}}\underset{(Anhydrous\,AlC{{l}_{3}})}{\mathop{A{{l}_{2}}C{{l}_{6}}}}\,\] Note: Anhydrous \[AlC{{l}_{3}}\] exists in form of dimer as \[A{{l}_{2}}C{{l}_{6}}\]
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