An inorganic Lewis acid (X) fumes in moist air and intensity of fumes increases when a rod dipped in NH_(4)OH is brought near to it. An acidic solution of) on addition of NH_(4)Cl and NH_(4)OH.gives a precipitate which dissolves in NaOH solution. An acidic solution of (X) does not give precipitate with H_(2)S. Hence, the compound is

An inorganic Lewis acid (X) fumes in moist air and intensity of fumes

1.	An inorganic Lewis acid (X) fumes in moist air and intensity of fumes increases when a rod dipped in NH_(4)OH is brought near to it. An acidic solution of) on addition of NH_(4)Cl and NH_(4)OH.gives a precipitate which dissolves in NaOH solution. An acidic solution of (X) does not give precipitate with H_(2)S. Hence, the compound is
Answer» `FeCl_(3)` `AlCl_(3)` `SnCl_(2)` `ZnCl_(2)` Solution :`(X) is `AlCl_(3)` `AlCl_(3)underset(moisture)(+3H_(2)O)toAl(OH)_(2)darrunderset(fumes)(+3HCL)` `AlCl_(3)+3NH_(4)OHtoAl(OH)_(3)darr+3NH_(4)Cl` `AL(OH)_(3)+NaOHtoNaAlO_(2)+H_(2)O` `AlCl_(3)+H_(2)S+H^(+)to"No ppt."` HENCE,(B) is the CORRECT answer.