MCQ practice · SSC Chemistry Board questions · Chapter 8: Chemistry and Energy
Which will be discharged first at the cathode?
Think it through first, then pick an option.
- a Mg²⁺
- b Fe²⁺
- c Sn²⁺
- d Pb²⁺
Answer and explanation
Correct answer: d Pb²⁺
Of the four, Pb²⁺ is lowest in the series, so it is discharged first.
Why the other options are wrong
- a Mg²⁺: Mg²⁺ is high in the series and is discharged late.
- b Fe²⁺: Sn²⁺ and Pb²⁺ lie below Fe²⁺, so Fe²⁺ is not discharged first.
- c Sn²⁺: Pb²⁺ sits just below Sn²⁺, so Pb²⁺ goes first.
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