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 th

Question

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:

Accepted Answer

AlCl3. The compound 'X' is AlCl3. It does not form a precipitate with H2S in acidic medium, gives a white precipitate with NH4OH (Al(OH)3), which dissolves in excess NaOH forming a soluble aluminate. The fuming and reaction with NH4OH to form dense white fumes confirm the presence of AlCl3.

Solution

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