A) white turning to red
B) white turning to grey
C) black turning to white
D) none
Correct Answer: B
Solution :
Stannous chloride \[(SnC{{l}_{2}})\] is a good reducing agent. It reduces \[\text{HgC}{{\text{l}}_{\text{2}}}\] into Hg (grey precipitate), in two steps. \[SnC{{l}_{2}}+2HgC{{l}_{2}}\xrightarrow{{}}SnC{{l}_{4}}+\underset{\text{white}}{\mathop{HgC{{l}_{2}}\downarrow }}\,\] \[SnC{{l}_{2}}+H{{g}_{2}}C{{l}_{2}}\xrightarrow{{}}\underset{\text{grey}}{\mathop{SnC{{l}_{4}}+2Hg\downarrow }}\,\]
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