(I) A hot metal M burns in acidic gas A and produces B and C.
(II) B reacts with `KMnO_(4)` giving rise to brown ppt.
(III) Creacts with dil. `H_(2)SO_(4)` , giving the same gas A.
(IV) C on heating produces E and F.
(V) E reacts with dil. `H_(2)SO_(4)` releasing rotten egg's smell.
(VI) F reacts with `Pb(NO_(3))_(2)` giving rise to white ppt. which does not dissolve in dil. mineral acid but is soluble in `(NH_(4))_(2)C_(2)O_(4)`
Analogous sodium compound of B on heating produces a polysulphide having the unit of `S_(x)^(2-)` ion. The value of x is

Options

A. 2
B. 3
C. 5
D. 6

Answer

C