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MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions

Rajshahi Board 2024

In the stem-

  1. i. the reaction of solutions A and B is a non-redox reaction
  2. ii. adding solution A to a Cu²⁺ solution gives a light blue precipitate
  3. iii. the salt formed from A and B is acidic

Think it through first, then pick an option.

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

Correct answer: d i, ii and iii

All three are true: it is a neutralization, so non-redox (i); Cu²⁺ + OH⁻ gives light blue Cu(OH)₂↓ (ii); NH₄Cl is an acidic salt (iii).

Why the other options are wrong

  • a i and ii: i and ii are true, but iii is left out: NH₄Cl is the salt of a weak base and a strong acid, so it is acidic.
  • b i and iii: i and iii are true, but ii is left out: ammonia solution supplies OH⁻, so it gives a light blue Cu(OH)₂ precipitate with Cu²⁺.
  • c ii and iii: ii and iii are true, but i is left out: NH₃ + HCl → NH₄Cl has no electron transfer; it is a neutralization, non-redox.

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