Q.61. Given below are two statements for catalytic properties of transition metals :
Statement I: Fi

Q: What is the correct answer for JEE Main Chemistry Q61?

The correct answer is B. Sol. Statement I: First-row transition metals (and transition metals in general) utilize both their (n-1)d and ns electrons (e.g., 3d and 4s for first row) for bonding with reactant molecules and atoms on the catalyst surface. This allows them to form intermediate compounds and provide a surface for reactions. Therefore, the statement that they use *only* 3d electrons is incorrect. Statement I is

Q: Q.61. Given below are two statements for catalytic properties of transition metals : Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for formation of…

The correct answer is B. Sol. Statement I: First-row transition metals (and transition metals in general) utilize both their (n-1)d and ns electrons (e.g., 3d and 4s for first row) for bonding with reactant molecules and atoms on the catalyst surface. This allows them to form intermediate compounds and provide a surface for reactions. Therefore, the statement that they use *only* 3d electrons is incorrect. Statement I is

Q: What are the options for this JEE Main Chemistry question?

A. Both Statement I and Statement II are correct · B. Both Statement I and Statement II are incorrect · C. Statement I is correct but Statement II are incorrect · D. Statement I is incorrect but Statement II are correct

Question

Q.61. Given below are two statements for catalytic properties of transition metals :
Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for formation of bonds between reactant molecules and atoms on the surface of catalyst.
Statement II: There is increase in the concentration of reactants on the surface of catalyst which strengthens the bonds in reacting molecules.
In the light of the above statements, choose the correct answer from the option given below :

FirstInTest · Accepted Answer

Sol. Statement I:
First-row transition metals (and transition metals in general) utilize both their (n-1)d and ns electrons (e.g., 3d and 4s for first row) for bonding with reactant molecules and atoms on the catalyst surface. This allows them to form intermediate compounds and provide a surface for reactions. Therefore, the statement that they use *only* 3d electrons is incorrect. Statement I is false.
Statement II:
Adsorption of reactants on the catalyst surface increases the concentration of reactants, which is true. However, this adsorption *weakens* the bonds within the reacting molecules, making them easier to break and react, rather than strengthening them. This lowering of activation energy facilitates the reaction. Therefore, the statement that it strengthens the bonds in reacting molecules is incorrect. Statement II is false.
Both Statement I and Statement II are incorrect.

Answer

Both Statement I and Statement II are correct

Answer

Both Statement I and Statement II are incorrect

Answer

Statement I is correct but Statement II are incorrect

Answer

Statement I is incorrect but Statement II are correct

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