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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df043

Select ALL correct statements.

A $Cu X^{+}$ disproportionates in aqueous solution to $Cu X^{2 +}$ and Cu
BThe spin-only magnetic moment of free $Fe X^{3 +}$ is $5.92 BM$
C $E^{\circ} (Mn X^{3 +} / Mn X^{2 +})$ is more positive than $E^{\circ} (Cr X^{3 +} / Cr X^{2 +})$
D $Zn X^{2 +}$ is paramagnetic with two unpaired electrons

Answer: A, B, C

The Mn couple is about

+ 1.5 V

and the Cr couple about

- 0.41 V

.

Cu X^{+}

disproportionates because

Cu X^{2 +}

is strongly hydrated, and

Fe X^{3 +}

(

d^{5}

) gives

35 = 5.92 BM

.

Zn X^{2 +}

is

d^{10}

and diamagnetic.

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