The correct statements among the following about solid catalysts is -
| a. | Same reactants may give different products by using different catalysts |
| b. | Catalyst does not change ∆ H of reaction |
| c. | Catalyst is required in large quantities to catalyse reactions |
| d. | Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption |
1. a and b
2. b and c
3. c and d
4. a and d
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