d and f-Block ElementsMedium
Question
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Generally, $3d$ transition metals have high melting points.
Reason R: Involvement of $3d$-electrons in addition to $4s$-electrons in the interatomic metallic bonding.
In light of the above statements, choose the most appropriate answer from the options given below:
Options
A.$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct.
B.$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct
C.Both A and R are correct and R is the correct explanation of A
D.Both A and R are correct and R is NOT the correct explanation of A
Solution
Sol. [Key Concept: Assertion–Reason evaluation]
The melting points of 3d transition metals are generally high. This is attributed to the involvement of greater number of electrons from (n -1) d in addition to the ns electrons in the interatomic metallic bonding.
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