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Assertion : Lanthanoids show a limited o...

Assertion : Lanthanoids show a limited of ixidation states wheres actanoids show a large number of oxidation states.
Reason : Energy gap between `4f, 5d` and `6s` subshells is small wheras that between `5f, 6d` and `7s` subshell is large.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation of Statement -1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation of Statement-1

C

Statement-1 is True, Statement-2 is false

D

Statement-1 is False, Statement-2is True

Text Solution

Verified by Experts

Statement-2. is False because energy gap beween 4f, 5d and 6s is large whereas that between 5f, 6dand 7s is small.
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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 are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name an element of lanthanoid series, which is known to show +4 oxidation state. Is it a strong oxidising agent or reducing agent?

Knowledge Check

  • Assertion: Manganese shows a number of oxidation states. Reason: The difference of energy between 3d and 4s subshells is large.

    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.

  • Assertion : Manganese show a maximum oxidation state of + 5 . Reason : Manganese has 5 electrons in the 3d subshell.

    A
    If both assetion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are ture but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • STATEMENT-1 : Lanthanoids show less oxidation states than actinoids and STATEMENT-2: 4f subshell is dieperseated than 5f .

    A
    Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1
    B
    Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1
    C
    Statement-1 is True , Statement-2 is False
    D
    Statement-1 is False , Statement-2 is True

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    Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Which is the last element of the actinoid series? Write its electronic configuration.

    Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name two lanthanoids which exhibit +2 oxidation state.

    Since, lanthanides relased electron from 4f, 5d and 6s orbitals, they show

    Statement 1 : Energy gap between 4f, 5d and 6s subshells is small whereas that between 5f, 6d and 7s subshells is large. Statement 2 : Langhanoides show a limited number of oxidation state whereas actinoids show a large number of oxiation states.

    The transition element ( with few exceptions ) show a large number of oxidation states . The various oxidation states are related to the electronic configuration of their atoms. The variable oxidation states of a transition metal is due to the involvement of (n-1)d and outer ns electrons . For the first five elements of 3d transition series , the minimum oxidation state is equal to the number of electrons in 4s shell and the maximum oxidation state is equal to the sum of 4s and 3d electrons. The relative stability of various oxidation states of a given element can be explained on the basis of stability of d^(0),d^(5) and d^(10) configuration . In 3d series, the maximum oxidation state is shown by

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