Which one of the following chemical reactions is not feasible?

Which one of the following chemical reactions is not feasible?

Join Our Telegram Channel

Fe + CuSO₄ → FeSO₄ + Cu

Zn + CuSO₄ → ZnSO₄ + Cu

Cu + PbCl₂ → CuCl₂ + Pb

Mg + CuSO₄ → MgSO₄ + Cu

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CDS-1 – 2020

Download PDF Attempt Online

A chemical reaction where a metal displaces another metal from its salt solution is feasible only if the displacing metal is more reactive than the metal being displaced. The reactivity series of metals dictates this.

Comparing the reactivity of the metals involved: Magnesium (Mg) > Zinc (Zn) > Iron (Fe) > Lead (Pb) > Copper (Cu).
– A) Fe + CuSO₄: Fe is more reactive than Cu. Fe displaces Cu. Feasible.
– B) Zn + CuSO₄: Zn is more reactive than Cu. Zn displaces Cu. Feasible.
– C) Cu + PbCl₂: Cu is less reactive than Pb. Cu cannot displace Pb. Not feasible.
– D) Mg + CuSO₄: Mg is more reactive than Cu. Mg displaces Cu. Feasible.

The reactivity series is determined experimentally and shows the relative tendency of metals to lose electrons and form positive ions. More reactive metals are higher in the series.

More similar MCQ questions for Exam preparation:-