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Question

An inorganic Lewis acid (X) fumes in moist air, and intensity of fumes increases when a rod dipped in NH4OH is brought near to it. An acidic solution of (X) on addition of NH4Cl and NH4OH gives a precipitate which dissolves in NaOH solution. An acidic solution of (X) does not give precipitate with H2S. Hence, the compound (X) is :

A
FeCl3
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B
AlCl3
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C
SnCl2
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D
ZnCl2
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Solution

The correct option is B AlCl3
The compound (X) is AlCl3.
AlCl3 + 3H2O Al(OH)3 + 3HCl
(moisture) (fumes)
AlCl3+3NH4OHAl(OH)3 + 3NH4Cl
Al(OH)3 +NaOH NaAlO2+2H2OAlCl3+H2S+H+Noppt.

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