MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
What is the latent valency of N in N₂O₅?
Think it through first, then pick an option.
- a 0
- b 2
- c 3
- d 5
Answer and explanation
Correct answer: a 0
Five O (5 × 2 = 10) shared between two N give each N an active valency of 5, which is also its highest; latent 0.
Why the other options are wrong
- b 2: 2 would fit an active valency of 3 (as in NH₃); in N₂O₅ the active valency is 5, so latent 0.
- c 3: 3 is nitrogen's valency in NH₃; in N₂O₅ it is 5 − 5 = 0.
- d 5: 5 is N's active valency in N₂O₅; its latent valency is 5 − 5 = 0.
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