Light green (compound 'A')`overset(Delta)(to)"white Residue(B)"overset("high")underset("Temp.")C+D+E`
(i)'D' and 'E' are two acidic gas.
(ii) 'D' is passed through `HgCl_(2)` solution to give yellow ppt.
(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, yellow ppt. is obtained but white ppt does not turn into grey on addition of excess solution of 'A'
Q. Yellow ppt in the above observation is :

Options

A. `0`
B. `2`
C. `7`
D. `5`

Answer

C