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Question

An acidic solution of ‘X’ does not give precipitate on passing H2S gas. ‘X’ gives a white precipitate when NH4OH is added to it. The white precipitate dissolves in excess of NaOH
solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in NH4OH is held in the fumes. The compound ‘X’ is:

A
SnCl2
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B
ZnCl2
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C
FeCl3
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D
AlCl3
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Solution

The correct option is D AlCl3
since compound ‘X’ do not give any ppt with H2S, it cannot be ZnCl2 or SnCl2.
The salt should contain chloride radical as it gives dense white fumes with NH4OH. The salt solution gives precipitate with NH4OH which is soluble in excess of NaOH. Hence it is not ferric chloride. The salt should be AlCl3.

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