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The transition metals and their compounds are used as catalysts because of the variable oxidation states. Due to this, they easily absorb and re-emit wide range of energy to provide the necessary activation energy.

1. The transition metals and their compounds are used as catalysts because of the variable oxidation states.
2. Due to this, they easily absorb and re-emit wide range of energy to provide the necessary activation energy.
3. Both (a) and (b).
4. None of the above.

Correct answer: Both (a) and (b).

Solution

Both statements (A) and (B) are correct. Transition metals exhibit variable oxidation states, which allows them to act as catalysts by facilitating electron transfer and lowering activation energy.

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