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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations1 Mark
MCQ
Which of the  following equation is not correct?
  • A
    2AgBr(s)+ Sunlight → 2Ag(s) + Br2(g).
  • B
    FeSO4(s) + Cu(aq) → CuSO4(aq) + Fe(s).
  • C
    Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s).
  • D
    Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s).
✓

Answer

  1. FeSO4(s) + Cu(aq) → CuSO4(aq) + Fe(s).

Explanation:

The equation FeSO4(s) + Cu(aq) → CuSO4(aq) + Fe(s) is incorrect.

Because fe is highly recative compared to Cu and hence Cu cannot replace Fe from its solution.

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

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