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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
MCQ
When a piece of magnesium ribbon is placed in a beaker of copper sulfate solution, which one of the following is most likely to happen?
  • A
    A vigorous reaction immediately takes place, with the release of a lot of heat.
  • B
    The blue colour of the copper sulfate solution gets darker.
  • ✓
    The blue colour of the copper sulfate solution gets lighter.
  • D
    The magnesium catches fire.
✓

Answer

Correct option: C.
The blue colour of the copper sulfate solution gets lighter.
$\mathrm{Mg}+\mathrm{CuSO}_4 \rightarrow \mathrm{MgSO}_4+\mathrm{Cu}$
$($Blue$)$
By adding Magnesium to $\mathrm{CuSO}_4$​, it turns to $\mathrm{MgSO}_4$​.
Because $\text{Mg}$ is above $\text{Cu}$ in reactivity series.
So $\text{Mg}$ displaces $\text{Cu}$ in $\mathrm{CuSO}_4$​.
As reaction processes, $\mathrm{CuSO}_4$ content decreases.

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