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Assertion (A) : V_(2)O_(5) catalyst is used in Haber's process for the manufacture of ammonia. Reason (R) : The principal oxidation state for lanthanoids is +3 although +2 and +4 oxidation states are also exhibited.

Answer»

Both ASSERTION (A) and REASON (R) are CORRECT statements, and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is correct, but Reason (R) is incorrect statement.
Assertion (A) is incorrect, but Reason (R) is correct statement.

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