zincite is a carbonate ore.

Sodium cyanide cannot be used in the metallurgy of silver.

aniline is a froth stabilizer.

zone refining process is used for the refining of titanium.

(I)-(c) ; (II)-(a) ; (III)-(b) ; (IV)-(d)

(I)-(c) ; (II)-(d) ; (III)-(b) ; (IV)-(a)

(I)-(b) ; (II)-(d) ; (III)-(a) ; (IV)-(c)

(I)-(b) ; (II)-(c) ; (III)-(d) ; (IV)-(a)

siderite

bauxite

malachite

calamine

Both the assertion and reason are correct and the reason is the correct explanation for the assertion.

Only the reason is correct.

Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.

Only the assertion is correct.