MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
In the stimulus:
- i. AE is polar covalent
- ii. DG₂ dissolves in water
- iii. an aqueous solution of DA₂ conducts electricity
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: d i, ii and iii
A = H, D = Mg, E = F, G = Cl: HF is polar covalent, MgCl₂ dissolves, and MgH₂, being ionic, gives a conducting solution.
Why the other options are wrong
- a i and ii: iii is true too: DA₂ (MgH₂) is ionic, so ions carry current in solution.
- b i and iii: ii is true too: DG₂ (MgCl₂) is ionic and dissolves in water.
- c ii and iii: i is true too: AE (HF) is polar covalent.
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