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Solution


Q.

Match List-I with List-II.                                          [2024]

  List-I (Atom/Molecule)   List-II (Property)
A. Nitrogen atom I. Paramagnetic
B. Fluorine molecule II. Most reactive element in group 18
C. Oxygen molecule III. Element with highest ionisation enthalpy in group 15
D. Xenon atom IV. Strongest oxidising agent

 

Identify the correct answer from the options given below:
1 A–III, B–I, C–IV, D–II  
2 A–I, B–IV, C–III, D–II  
3 A–II, B–IV, C–I, D–III  
4 A–III, B–IV, C–I, D–II  

Ans.

(4)

(A) In group 15, the ionisation enthalpy decreases down the group due to increase in atomic size and screening effect, so N has the highest ionisation enthalpy.

(B) Fluorine is most reactive halogen, it can replace chloride, bromide and iodide ions in solution. In fact, fluorine is so reactive that it attacks water and displaces the oxygen of water. Thus, it is the strongest oxidising agent.

(C) Electronic configuration of O2 is

σ(1s)2 σ*(1s)2 σ(2s)2 σ*(2s)2 σ(2pz)2 π(2px)2=π(2py)2π*(2px)1=π*(2py)1

It has two unpaired electrons, so it is paramagnetic in nature.

(D) Xenon, due to its low ionisation enthalpy, is a most reactive element of group 18 and forms a large number of compounds.