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MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond

Barishal Board 2022

For HF:

  1. i. it is polar
  2. ii. it follows the duet rule
  3. iii. it dissolves in water

Think it through first, then pick an option.

  1. a i and ii
  2. b ii and iii
  3. c i and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: d i, ii and iii

HF is polar, H (1 pair) and F (4 pairs) follow the duet rule, and being polar it dissolves in water.

Why the other options are wrong

  • a i and ii: iii is true too: polar HF dissolves in water.
  • b ii and iii: i is true too: HF is polar. The answer the book supports is i, ii and iii.
  • c i and iii: ii is true too: H and F both hold electrons in pairs.