Q65 / 180 · AIIMS 2016 · Chemistry

Assertion : In electrolysis, the quantity of electricity needed for depositing 1 mole of silver is different from that required for 1 mole of copper. Reason : The molecular weights of silver and copper are different.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

$\mathrm{Ag}^{+}+e^{-} \rightarrow \mathrm{Ag}, \mathrm{Cu}^{2+}+2 e^{-} \rightarrow \mathrm{Cu}$ For deposition of $\mathrm{Ag}, 1$ mole of electrons is required while for $\mathrm{Cu}, 2$ moles of electrons are required. So quantity of electricity needed for depositing is different.

Hence, the correct answer is option: 'B'.

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