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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

Assertion and reason both are correct statements and reason is correct explanation for assertion.

B

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C

Assertion is correct statement but reason is wrong statement.

D

Assertion is wrong statement but reason is correct statement

Text Solution

Verified by Experts

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

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

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

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.

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.

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.