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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2026 · Chemistry · d and f Block Elements

Given below are two statements : One is labelled as Assertion A and...

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Generally, 3d3d transition metals have high melting points.
Reason R : Involvement of 3d3d-electrons in addition to 4s4s-electrons in the interatomic metallic bonding.
In light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. AA\text{A} is not correct but R\text{R} is correct.
  2. BBoth A\text{A} and R\text{R} are correct and R\text{R} is the correct explanation of A\text{A}.
  3. CBoth A\text{A} and R\text{R} are correct and R\text{R} is NOT the correct explanation of A\text{A}.
  4. DA\text{A} is correct but R\text{R} is not correct.

Correct answer

B. Both A\text{A} and R\text{R} are correct and R\text{R} is the correct explanation of A\text{A}.

Step-by-step solution

Assertion A is correct because transition metals generally have high melting points due to strong metallic bonding.

Reason R is correct and explains Assertion A because the strong metallic bonding in 3d3d transition metals is attributed to the involvement of a greater number of electrons from the 3d3d subshell in addition to the 4s4s electrons in the interatomic metallic bonding.

Thus, both A and R are correct and R is the correct explanation of A.

Answer: Both A\text{A} and R\text{R} are correct and R\text{R} is the correct explanation of A\text{A}.
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