A) white turning to red
B) white turning to grey
C) black turning to white
D) None of the above
Correct Answer: B
Solution :
Stannous chloride \[(SnC{{l}_{2}})\] is a good reducing agent. It reduces mercuric chloride \[(HgC{{l}_{2}})\]to white ppt. of mercurous chloride \[(H{{g}_{2}}C{{l}_{2}})\] and then reduces \[H{{g}_{2}}C{{l}_{2}}\] into grey ppt. of mercury. The following reaction takes place in two steps. \[SnC{{l}_{2}}+HgC{{l}_{2}}\xrightarrow{{}}SnC{{l}_{4}}+\underset{white\text{ }ppt.}{\mathop{H{{g}_{2}}C{{l}_{2}}\downarrow }}\,\] \[SnC{{l}_{2}}+H{{g}_{2}}C{{l}_{2}}\xrightarrow{{}}SnC{{l}_{4}}+\underset{grey\text{ }ppt.}{\mathop{2Hg\downarrow }}\,\] Therefore, addition of \[SnC{{l}_{2}}\] to \[HgC{{l}_{2}}\] gives white ppt. turning to grey ppt.
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