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