Assertion : When `SnCl_(2)` solution is added to `HgCl_(2)` solution, a milky white precipitate is obtained and on adding excess `SnCl_(2)`, a black precipitate is formed.
Reason : The disproportionation if Hg(II) is easier than its reduction only.

Options

A. Both A and R are true and R is a correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. Both A and R are false

Answer

C

Explanation

`SnCl_(2)+2HgCl_(2)tounderset("white ppt")(Hg_(2)Cl_(2)darr)+SnCl_(4)`
`Hg_(2)Cl_(2)+SnCl_(2)tounderset("grey ppt")(2Hgdarr)+SnCl_(4)`