Chemistry - Complete d-block Question with Solution | TestHub

In acidic medium, KMnO₄ oxidizes I⁻ to I₂, but in basic medium, iodide is not converted into I₂. Hence, statement (A) is incorrect.

Pig iron contains a high amount of carbon and impurities, so it is not the purest form of iron. Wrought iron is the purest form. Hence, (B) is incorrect.

Calcium salts give a brick red flame and barium salts give an apple green flame in flame tests. Hence, (C) is correct.

The boiling point order of group 12 elements is:

$Zn>Cd>Hg$

Hence, (D) is correct.