Question

Based on the activity series, which one of the reactions below will occur (Spontaneous)? A. Mn (s) + NiCl2 (aq) → MnCl2 (aq) + Ni (s) B. SnBr2 (aq) + Cu (s) → CuBr2 (aq) + Sn (s) C. Pb (s) + NiI2 (aq) → PbI2 (aq) + Ni (s) D. Fe (s) + ZnCl2 (aq) → FeCl2 (aq) + Zn (s) E. None of the reactions will occur.

Answer 1

Answer:

Mn (s) + NiCl2 (aq) → MnCl2 (aq) + Ni

Explanation:

The order of displacement of metals from aqueous solution by another metal is defined by the activity series of metals.

The activity series arranges metals in order of reactivity and increasing electrode potentials. The less negative the electrode potential of a metal is, the less reactive it is and the lower it is found in the activity series.

Nickel has a less negative electrode potential than manganese hence it is displaced from an aqueous solution of its salt by manganese spontaneously.