Home
Class 12
CHEMISTRY
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

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.

Text Solution

Verified by Experts

The correct Answer is:
C
Reason is false because energy gap between `4f`, `5d` and `6s` is large whereas that between `5f, 6d` and is small.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • THE D AND F BLOCK ELEMENTS

    A2Z|Exercise AIPMT/NEET Questions|31 Videos

  • THE D AND F BLOCK ELEMENTS

    A2Z|Exercise AIIMS Questions|31 Videos

  • THE D AND F BLOCK ELEMENTS

    A2Z|Exercise Lanthanides And Actinides|29 Videos

  • SURFACE CHEMISTRY

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

Statement-1. Lanthanoids show a limited number of oxidation states whereas actinoids show a large number of oxidation states. Statement-2. Energy gap between4f, 5d and 6s subshells is small whereas that between 5f, 6d and 7s subshells is large.

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

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

    • Similar Questions

    Explore conceptually related problems

    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?

    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.

    Home
    Profile