(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)

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.

siderite

bauxite

malachite

calamine

sphalerite

magnetite

malachite

cryolite