[SEE DIAGRAM] [A] colourless salt --(KOH, Δ)-- [B] gas (gives white fumes with HCl) [A] colourless salt --(CaCl2)-- [C] white ppt. --(KMnO4, purple)-- colourless solution

Question

[SEE DIAGRAM]
[A] colourless salt --(KOH, Δ)--> [B] gas (gives white fumes with HCl)
[A] colourless salt --(CaCl2)--> [C] white ppt. --(KMnO4, purple)--> colourless 
solution

Prashant Kotian · Accepted Answer

Correct answer: C. Gas [B] giving white fumes with HCl is NH3, indicating the presence of NH4+. The formation of a white ppt [C] with CaCl2 that decolorizes purple KMnO4 indicates C2O4^2- (oxalate). Thus, [A] is (NH4)2C2O4.

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