Assertion : Europium $(II)$ is more stable than cerium $(II)$.
Reason : Cerium salts are used as catalyst in petroleum cracking.
Reason : Cerium salts are used as catalyst in petroleum cracking.
- AIf both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
- BIf both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
- CIf the Assertion is correct but Reason is incorrect.
- DIf both the Assertion and Reason are incorrect.
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Similar Questions
Consider the following two statements:
$Statement-I:$ Among $Mg, Al, Mg^{2+}, Al^{3+}$,the one having the smallest size is $Al^{3+}$.
$Statement-II:$ $Eu$ has an exceptionally high atomic radius among lanthanide elements.
The correct answer is:
$Statement-I:$ Among $Mg, Al, Mg^{2+}, Al^{3+}$,the one having the smallest size is $Al^{3+}$.
$Statement-II:$ $Eu$ has an exceptionally high atomic radius among lanthanide elements.
The correct answer is:
Which of the following elements has a completely filled $4f$ orbital in its ground state electronic configuration?
Lanthanoids $(Ln)$ are well known for their $+3$ oxidation state. Which of the following statements is $NOT$ applicable to them?
Easy
View SolutionWhich of the following statements is incorrect?
Medium
View SolutionWhich of the following elements belongs to the actinoid series?
Easy
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