`Al_(2)O_(3)` can be converted to anhydrous `AlCl_(3)` by heating

Options

A. `Al_(2)O_(3)`with gas `Cl_(2)` gas
B. `Al_(2)O_(3)` with `HCl` gas
C. `Al_(2)O_(3)` with `NaCl` in solid gas
D. a mixture of `Al_(2)O_(3)` and `C` in dry `Cl_(2)` gas

Answer

D

Explanation

By passing a stream of dry chlorine over a mixture of aluminium oxide and charcoal heated to about `1000^(@)C`:
`Al_(2)O_(3)(s) + 3C(s) + 3Cl_(2)(g) rarr Al_(2)Cl_(6)(s) + 3CO(g)`