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Assertion: Actinoids show greater number...

Assertion: Actinoids show greater number of oxidation states than lanthanoids. Reason: Actinoids are radioactive.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A).

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A).

C

If (A) is correct, but (R) is incorrect.

D

If (A) is incorrect but (R) is correct.

Text Solution

Verified by Experts

The correct Answer is:
b
Correct R: in actinoids, the 5f, 6d and 7s subshells are close in energy whereas in lanthanoids 4f, 5d and 6s subshells have larger energy gaps.
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Assertion. Actinoids show larger number of oxidation states than lanthanoids. Reason. Highest oxidation state showsn by lanthanoids is +4 while that of actinoids is +7

Lanthanoids and actinoids.

Knowledge Check

  • How many actinoids are radioactive ?

    A
    Only one
    B
    7
    C
    14
    D
    12

  • Greater range of oxidation states of actinoids is because

    A
    5f, 6d and 7s levels are of comparable energies.
    B
    They possess large atomic numbers.
    C
    They possess large atomic masses.
    D
    They are radioactive.

  • Actinoids in general show more oxidation states than the lanthanoids. The main reason for this is

    A
    higher energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
    B
    lower energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
    C
    higher reactivity of actinoids than lanthanoids
    D
    actinoids are more basic than lanthanoids.

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    The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

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