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 NH4CI 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

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FeCl3

AlCl3

SnCl2

ZnCl2

answer is B.

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Detailed Solution

(X) is AlCl3AlCl3+3H2O⟶Al(OH)3↓+3HCl (Moisture) (Fumes) AlCl3+3NH4OH⟶Al(OH)3↓+3NH4Cl Al(OH)3+NaOH⟶NaAlO2+2H2O AlCl3+H2S+H⊕⟶ Noppt.

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