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p-Block Elements (Group 15–18)

JEE Main 2025 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

The incorrect statement among the following is

  1. PH3 shows lower proton affinity than NH3.
  2. SO2 can act as an oxidizing agent, but not as a reducing agent.
  3. NO2 can dimerise easily.
  4. PF3 exists but NF5 does not.

Answer

(2) SO2 can act as an oxidizing agent, but not as a reducing agent.

Solution

Concept: check each statement.

(1) lone pair of P in PH3 is diffuse (weaker base) ⇒ (1) is correct

(2) S in SO2 is +4 (intermediate) ⇒ it is also a reducing agent:

5SO2 + 2MnO4- + 2H2O 5SO42- + 2Mn2+ + 4H+ ⇒ (2) is incorrect

(3) 2NO2 N2O4 (odd electron) ⇒ (3) is correct

(4) N has no d orbitals, max covalency 4 ⇒ (4) is correct

Answer: (2)

Keep practising — p-Block Elements (Group 15–18)

Ques. 2JEE Main 2025, 22 January (Evening Shift)

The maximum covalency of a non-metallic group 15 element ' E ' with weakest E-E bond is :

  1. 5
  2. 3
  3. 4
  4. 6

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