Light green (Compound 'A') `overset(Delta)(rarr)White Residue '(B)' `underset("Temp")overset("High")(rarr)C+D+E`
`i)` 'D' and 'E' are two acidic gases.
ii) 'D' is passed through `HgCl_(2)` solution to give yellow pt.
`iii)` 'E' is passed through water first and then `H_(2)S` is passed, white turbidity is obtained.
`iv)` A is water soluble and addition of `HgCl_(2)` in it, white ppt is obtained but white ppt does not turn into grey on addition of excess solution of 'A'.
Yellow ppt in the above observation is

Options

A. Mercuric (II) sulphite
B. Basic mercury(II) sulphite
C. Basic mercury (II) sulphate
D. Mercuric iodide

Answer

C

Explanation

`FeSO_(4).7H_(2)Ooverset(Delta)(rarr)underset((B))(FeSO_(4))+7H_(2)O`
`underset((B))(2FeSO_(4))overset(Delta)(rarr)2FeO+SO_(2)+SO_(3)`
`underset(A)(2KMnO_(4))overset(Delta)(rarr)underset(B)(K_(2)MnO_(4))+underset(C)(MnO_(2))+underset(D)(O_(2))`