JEE Main 2021 (Online) 16th March Morning Shift | d and f Block Elements Question 143 | Chemistry

Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : Size of Bk³⁺ ion is less than Np³⁺ ion.

Reason R : The above is a consequence of the lanthanoid contraction.

In the light of the above statements, choose the correct answer from the options given below :

Both A and B are true and R is the correct explanation of A

A is false but R is true

A is true but R is false

Both A and B are true but R is not the correct explanation of A

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

Which one of the following lanthanoids does not form MO₂? [M is lanthanoid metal]

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I : CeO₂ can be used for oxidation of aldehydes and ketones.

Statement II : Aqueous solution of EuSO₄ is a strong reducing agent.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is true but Statement II is false.

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

In which of the following pairs, the outer most electronic configuration will be the same?

Cr⁺ and Mn²⁺

Ni²⁺ and Cu⁺

V²⁺ and Cr⁺

Fe²⁺ and Co⁺