Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2026Chemistryd and f Block ElementsActual

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

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

Correct answer

B. Both A and R are correct and R is the correct explanation of 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 3d transition metals is attributed to the involvement of a greater number of electrons from the 3d subshell in addition to the 4s electrons in the interatomic metallic bonding. Thus, both A and R are correct and R is the correct explanation of A. Answer: Both A and R are correct and R is the correct explanation of A .

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because : 2026The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58 , Nd =60 , Tb =65 and Ho =67 ) 2026The green paramagnetic species formed by heating KMn O₄ at 513 K is 2026The calculated 'spin-only' magnetic moment of Ti ²⁺ (3d^2) is : 2026Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V ₂ O ₅ I. Preparation of ammonia from N ₂/ H ₂ mixture B. Fe II. Polymerisation 2026Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr ²⁺ ion ( Z 2025Which of the following set of ions act as oxidising agents? 2024The UV-visible absorption bands in the spectra of lanthanoid ions are ' X ', probably because of the excitation of electrons involving ' Y '. The ' X ' and ' Y ', respectively, are 2024 Full d and f Block Elements list All NEET PYQs