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An acidic solution of 'X' does not give precipitate on passing H2S through it. 'X' gives white precipitate when NH4OH is added to it. The 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 put in the fumes. Compound 'X' can be:
- ZnCl2
- FeCl3
- AlCl3
- SnCl2
Correct answer: SnCl2
Solution
SnCl2 is a tin(II) compound that does not react with H2S, but forms a white precipitate with NH4OH, which dissolves in excess NaOH. SnCl2 also fumes in air and forms white fumes when a glass rod dipped in NH4OH is put in the fumes.
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