MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
The A²⁺ ion in the stem is-
- i. able to give up electrons
- ii. able to accept electrons
- iii. smaller than A in size
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 is Fe, so A²⁺ is Fe²⁺. Fe²⁺ → Fe³⁺ + e⁻ (gives up), Fe²⁺ + 2e⁻ → Fe (accepts), and having lost electrons it is smaller than the Fe atom. All three are true.
Why the other options are wrong
- a i and ii: iii is also true: a cation has lost electrons, so it is smaller than its own atom.
- b i and iii: ii is left out: A is Fe (4th period, Fe²⁺ is 3d⁶); Fe²⁺ + 2e⁻ → Fe, so it can also accept electrons.
- c ii and iii: i is left out: Fe²⁺ → Fe³⁺ + e⁻, so it can also give up electrons.
More board questions on this topic
- Which is oxidized in the reaction Ca + Cl₂ → CaCl₂?
- In Mg + ZnSO₄ → MgSO₄ + Zn, which is oxidized?
- In Sn⁴⁺ + Fe²⁺ → Sn²⁺ + Fe³⁺, which is reduced?
- SnCl₂ + 2FeCl₃ → 2FeCl₂ + SnCl₄. In the reaction in the stem-
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