A white powder (A) on heating gave a non-combustible gas and a residue (B). The white compound A on reaction with `H_(2)S` in alkaline medium forms a precipitate (C ) which dissolves in dil. `CH_(3)COOH`. (B) can be disssolved in dil HCl to prepare a solution which gives a white precipitate with `K_(4)[Fe(CN)_(6)]`. Which of the following is true about B ?A. on heating it becomes yellowB. dissolves in `CH_(3)COOH`C. is balck in colourD. is insoluble in HCl

A white powder (A) on heating gave a non-combustible gas and a residue

1.	A white powder (A) on heating gave a non-combustible gas and a residue (B). The white compound A on reaction with `H_(2)S` in alkaline medium forms a precipitate (C ) which dissolves in dil. `CH_(3)COOH`. (B) can be disssolved in dil HCl to prepare a solution which gives a white precipitate with `K_(4)[Fe(CN)_(6)]`. Which of the following is true about B ?A. on heating it becomes yellowB. dissolves in `CH_(3)COOH`C. is balck in colourD. is insoluble in HCl
Answer» Correct Answer - A `ZnCO_(3)overset(Delta)(rarr)underset((B))(ZnO)+CO_(2)` yellow when hot but white when cold

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