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JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Match List I with List II : List I (Observation) (A) Dinitrogen is chemically unreactive at room temperature (B) Bismuth in the +5 oxidation state acts as a strong oxidizing agent (C) Nitrogen restricts its maximum covalency to 4 (D) Nitrogen exists as a diatomic gas while phosphorus forms a tetraatomic solid List II (Reason) (I) Reluctance of valence s-electrons to participate in bonding (II) Absence of vacant d-orb

Options

  1. A(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
  2. B(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  3. C(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
  4. D(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Correct answer

B. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)

Step-by-step solution

(A) Dinitrogen ( N₂ ) is chemically inert at room temperature due to the very high bond dissociation enthalpy of the N N triple bond. Thus, (A) matches with (III). (B) Bismuth is the heaviest element in Group 15. Due to the inert pair effect (reluctance of valence s-electrons to participate in bonding), its +5 oxidation state is highly unstable. Hence, Bi(V) readily accepts electrons to become Bi(III) , acting as a strong oxidizing agent. Thus, (B) matches with (I). (C) Nitrogen belongs to the second period and lac

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