Which of the following statements are correct about solid catalyst?

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Same reactants may give different products by using different catalysts

Catalyst does not change ΔH of reaction

Catalyst is required in large quantities to catalyst reactions.

Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption

answer is A.

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Detailed Solution

(a) same reactants may give different products by using different catalysts. As different catalysts have different specific functions to mold the reaction towards specific product. e.g. starting with H2 and co and using different catalysts, we get different products. (i) CO(g)+3H2(g)⟶NiCH4(g)+H2O(g) (ii) CO(g)+2H2(g)Cu/ZnOCr2O3CH3OH(g) (iii) CO(g)+H2(g)⟶CuHCHO(g)(b) Catalyst does not change of reaction as of reaction is difference between enthalpy of reactants and products. So, it does not change catalysed reaction.

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