MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
In forming the bonds of these compounds, the central atom obeys the octet rule:
- i. CCl₄
- ii. BCl₃
- iii. H₂S
Think it through first, then pick an option.
- a i and ii
- b ii and iii
- c i and iii
- d i, ii and iii
Answer and explanation
Correct answer: c i and iii
In CCl₄, C has 8; in H₂S, S has 2 shared and 2 unused pairs = 8; in BCl₃, B has only 6.
Why the other options are wrong
- a i and ii: ii is false: in BCl₃, B has only 3 pairs = 6.
- b ii and iii: ii is false: B does not complete an octet.
- d i, ii and iii: BCl₃ must go: B has only 6 electrons. The answer the book supports is i and iii.
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