JEE Main levelSingle correct optionDifficulty 2 of 3mt067
Assertion (A): Zinc carbonate is calcined in a large excess of air to get zinc oxide.
Reason (R): On heating, a carbonate ore decomposes thermally to the oxide with evolution of COX2.
Choose:
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: D
Calcination is done in the absence or limited supply of air, not excess air, so A is false. The decomposition ZnCOX3ZnO+COX2 is a thermal decomposition, so R is true. Hence A is false and R is true.