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MCQ-21
Select the specie that contains the maximum number of bond pairs
A. CO₂
B. H₂O
C. NH₃
D. BeH₂

Answer: A

MCQ-22
Which one of the following species contains no lone pair?
A. NH₄⁺
B. H₃O⁺
C. NH₃
D. Both a and b

Answer: A

MCQ-23
The high value of the first ionization energy of nitrogen than that of oxygen is due to its
A. High value of Z
B. Low value of the mass number
C. Increased shielding effect
D. Half-filled p–subshell

Answer: D

MCQ-24
Which of the following represents the correct arrangement of atoms according to their atomic radii?
A. Mg < Ca < Sr
B. Mg < Sr < Ca
C. Sr < Ca < Mg
D. Mg < Ca = Sr

Answer: A

MCQ-25
Which of the following has the largest size
A. F
B. F^–
C. O₂ ^–
D. N₃^–

Answer: D