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04/01/2022 2:06 pm
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Anhydrous AlCl3 cannot be obtained from which of the following reactions?
(a) Heating AlCl3.6H2O
(b) By passing dry HCl over hot aluminium powder
(c) By passing dry Cl2 over hot aluminium powder
(d) By passing dry Cl2 over a hot mixture of alumina and coke
1 Answer
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04/01/2022 2:14 pm
Correct answer: (a) Heating AlCl3.6H2O
Explanation:
2Al + 6HCl \(\overset{\Delta, air}\longrightarrow\) 2AlCl3 + 3H2
2Al + 2Cl2 → 2AlCl3
Al2O3 + 3C + 3Cl2\(\overset{1000 °C}\longrightarrow\) 2AlCl3 + 3CO
2AlCl3 → Anhydrous AlCl3
AlCl3.6H2O \(\overset{\Delta}\longrightarrow\) Al(OH)3 + 3HCl + 3H2O
Thus AlCl3 cannot be obtained by this method.