A. HCOOH
B. NaHCO3
C. FeCO3
D. H2C2O4
Correct Answer:
Option D – H2C2O4
Explanation
It should be noted that for X to liberate CO2, X must be a carbonate or an oxalate. Since X decolorizes KMnO4, X must be an oxalate. Therefore, X is H2C2O4.
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