MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
XY₃:
- i. the compound is hydrolysed
- ii. its aqueous solution is acidic
- iii. X has a complete octet in the compound
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: a i and ii
A BCl₃-type compound reacts with water (hydrolysis) and gives HCl, so the solution is acidic (i, ii). The central atom has 3 pairs = 6, so its octet is not complete and iii is false.
Why the other options are wrong
- b ii and iii: iii is false: the central atom has only 6 electrons, so the octet is not complete. i is true, so this also leaves out a true statement.
- c i and iii: iii is false: 3 pairs = 6, an incomplete octet. ii is true, so this also leaves out a true statement.
- d i, ii and iii: iii must go: the central atom has 6 electrons, so the octet is not complete.
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