Q. 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:
A) A is not correct but R is correct
B) Both A and R are correct and R is the correct explanation of A
C) Both A and R are correct but R is NOT the correct explanation of A
D) A is correct but R is not correct.
Explanation
[Solution from source] Besides the 4s electrons, unpaired (n−1)d electrons take part in metallic bonding, making it much stronger and giving high melting points. R explains A. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.