Match the ore in Column I with its formula in Column II. Column I: (P) Magnetite, (Q) Cerussite, (R) Calamine, (S) Cinnabar. Column II: (1) $HgS$ , (2) $PbCO X_{3}$ , (3) $ZnCO X_{3}$ , (4) $Fe X_{3} O X_{4}$ .

Answer: A

Magnetite is

Fe X_{3} O X_{4}

, cerussite is lead carbonate

PbCO X_{3}

, calamine is zinc carbonate

ZnCO X_{3}

and cinnabar is mercuric sulphide

HgS

. Hence P-4, Q-2, R-3, S-1.