IIT-JEE 2012 · Paper 1, Chemistry question 34

Precipitates. $\ce{AgNO3}$ gives AgCl (white), AgBr (pale yellow) and AgI (yellow). AgF is soluble in water, so HF gives no precipitate.

Thiosulphate. Each silver halide precipitate dissolves in sodium thiosulphate by forming the complex $\ce{[Ag(S2O3)2]^{3-}}$ (the basis of photographic fixing):
$$\ce{AgX + 2S2O3^{2-} -> [Ag(S2O3)2]^{3-} + X-}.$$

(A), (C), (D)