JEE Main levelSingle correct optionDifficulty 2 of 3sc072
Assertion (A): A solid catalyst used in a heterogeneous reaction is usually taken in finely divided form.
Reason (R): Finely dividing the solid increases its surface area and hence the number of active centres.
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: A
Heterogeneous catalysis occurs on the surface, so powdering the catalyst raises the surface area and the number of active centres per unit mass. Both statements are true and R explains A.