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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3eq183

Ferrous oxalate, $FeC X_{2} O X_{4}$ (molar mass $144 g mo l^{- 1}$ ), is completely oxidised by acidified $KMnO X_{4}$ to $Fe X^{3 +}$ and $CO X_{2}$ . Which statements are correct?

AOne mole of $KMnO X_{4}$ oxidises $\frac{5}{3}$ mol of $FeC X_{2} O X_{4}$ .
BA $0.060 M$ solution of $FeC X_{2} O X_{4}$ has normality $0.18 N$ for this reaction.
CThe n-factor of $FeC X_{2} O X_{4}$ is 3.
DThe equivalent mass of $FeC X_{2} O X_{4}$ is $144/2 = 72$ .

Answer: A, B, C

Fe gives 1 electron and oxalate gives 2, so n

= 3

; equivalent mass

= 144/3 = 48

, so the value 72 is wrong. Since

KMnO X_{4}

takes 5 electrons and each

FeC X_{2} O X_{4}

gives 3, 1 mol oxidises

5/3

mol. Normality

= 3 \times 0.060 = 0.18 N

.

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