JEE Main 2026 — d and f Block Elements Question with Solution
JEE Main 2026 (08 April Shift 2)
Question
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 options given below:
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 options given below:
Choose an option
Show full solutionCorrect option: B
Correct answer
BBoth Statement I and Statement II are incorrect
Step-by-step explanation
Statement I is incorrect because first row transition metals utilise both 3d and 4s electrons for the formation of bonds between reactant molecules and atoms on the surface of the catalyst.
Statement II is incorrect because the increase in the concentration of reactants on the surface of the catalyst weakens the bonds in the reacting molecules, which lowers the activation energy.
Therefore, both Statement I and Statement II are incorrect.
Answer: Both Statement I and Statement II are incorrect
Statement II is incorrect because the increase in the concentration of reactants on the surface of the catalyst weakens the bonds in the reacting molecules, which lowers the activation energy.
Therefore, both Statement I and Statement II are incorrect.
Answer: Both Statement I and Statement II are incorrect
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This is a previous-year question from JEE Main 2026, covering the d and f Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.