`CuFeS_(2)+O_(2)("excess")overset(Delta)(rarr)X`(hydrated salt is blue)+Y(s)(Unbalanced Equation)`:` Which is correct choice for (X) and (Y) ?A. (Y) on heating liberates `SO_(3)` onlyB. (X) forms bluish white ppt. with sodium hydroxide which redissolves in excess of sodium hydroxide.C. (Y) on reaction with potassium ferricyanide gives brown ppt.D.

`CuFeS_(2)+O_(2)("excess")overset(Delta)(rarr)X`(hydrated salt is blue

1.	`CuFeS_(2)+O_(2)("excess")overset(Delta)(rarr)X`(hydrated salt is blue)+Y(s)(Unbalanced Equation)`:` Which is correct choice for (X) and (Y) ?A. (Y) on heating liberates `SO_(3)` onlyB. (X) forms bluish white ppt. with sodium hydroxide which redissolves in excess of sodium hydroxide.C. (Y) on reaction with potassium ferricyanide gives brown ppt.D.
Answer» Correct Answer - A `CuFeS_(2)+4O_(2)overset(Delta)(rarr)CuSO_(4)(s)+FeSO_(4)(s)` `(A) CuSO_(4)+4KIrarrCu_(2)I_(2)+I_(2)+2K_(2)SO_(4)` `(B)2FeSO_(2)overset(Delta)(rarr)Fe_(2)O_(3)+SO_(2)+2SO_(3)` `(C ) CuSO_(4)+2NaOH rarr Na_(2)SO_(4)+Cu(OH)_(2)darr("insoluble in excess NaOH")` `(D) Fe^(2+)+2K_(3)[Fe(CN)_(6)]rarrFe_(3)[Fe9CN)_(6)]_(2)("deep vlue")`

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