1.

An inorganic lewise acid (X) fumes in moist air, andintensity offumesincreases when a red dippole in NH_(4)OH is thrugh tnear to it .An acidicsolution of (X) on additionofNH_(4)CI and NH_(4)OHgives a percipitate which dissolvein NaOH solution .An acidic, solution of (X) does notgiveprecipitate with H_(2)S Hence , the compound (X) is

Answer»

`FeCI_(3)`
`AICI_(3)`
`SnCI_(2)`
`ZnCI_(2)`

Solution :`(X)` is `AICI_(3)`
`UNDERSET("Mostone")(AICI_(3)) + 3H_(2)O rarr AI(OH)_(3) darr + underset(("Fumes"))(3HCI) `
`AICI_(3)+3NH_(4)OH rarr AI(OH)_(3) darr + 3NH_(4)CI`
`AI(OH)_(3) + NAOH rarr NaAIO_(2) + 2H_(2)O`
`AICI_(3) + H_(2)S + H^(o+) rarr` No ppt


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