White precipitate of AgCl turns to greyish or black when

1.	White precipitate of AgCl turns to greyish or black when
A.	reacts with \[N{{a}_{3}}As{{O}_{4}}\]
B.	exposed to sunlight
C.	reacts with \[{{K}_{2}}Cr{{O}_{4}}\]
D.	reacts with concentrated HCl
Answer» C. reacts with \[{{K}_{2}}Cr{{O}_{4}}\]

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White precipitate of AgCl turns to greyish or black when

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