JEE Main 26 Feb 2021 Shift 1 Solved Paper

(A) Kernite (Na2B4O7⋅4H2O) is sodium tetraborate tetrahydrate.
It is also called rasovite. Kernite is also written as
Na2B4O6(OH)2⋅3H2O
It is an ore of boron (ii).
(B) Cassiterite (SnO2) is the oxide. It is an ore of tin (i).
(C) Calamine (ZnCO3) is zinc carbonate. It is also called smith sonite. It is an ore of zinc (iv).
(D) Cryolite (Na3AlF6) is sodium hexafluoroaluminate. It is an ore of fluorine (iii).
So, correct match is (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii).