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Question

A colorless solid (A), when placed into water, produces heavy white turbidity to (B). Solid (A) gives a clear solution in conc.HCl when HCl solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When H2S is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide (NH4)2S. Conc.H2SO4 added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in HNO3 (1:1) to give a solution to which H2SO4 is added followed by addition of NH4OH when a white precipitate (F) is formed. (E) gives a black ppt. (G) with a solution of sodium stannite.

Compound B is not soluble in:

A
tartaric acid
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B
HCl
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C
HNO3
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D
H2SO4
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Solution

The correct option is A tartaric acid
BiCl3+H2OBiOCl+2HCl(A)whiteppt.(B)
BiOCl+2HClBiCl3+H2O(B)(A)
2BiCl3+3H2SBi2S3+6HClbrownblackppt.(C)
Bi2S3+8HNO32Bi(NO3)3+3S+2NO+4H2O
2Bi(NO3)3+3H2SO4Bi2(SO4)3+6HNO3
Bi2(SO4)3+6NH4OH2Bi(OH)3+3(NH4)2SO4whiteppt.(F)
2Bi(OH)3+3Na2SnO22Bi+3Na2SnO3+H2O(G)blackppt.
2BiCl3+3H2SO4Bi2(SO4)3+6HCl(D)
Hg2(NO3)2+2HClHg2Cl2+2HNO3whiteppt.(E)

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