Question

When a strip of metallic cobalt is placed in aqueous solution of nickel sulphate, the reaction occurs as

• A. $Co ^{2+}(s)+ Ni (a q) \longrightarrow Co (a q)+ Ni ^{2+}(s)$
• B. $Co (s)+ Ni ^{2+}(a q) \longrightarrow Co (a q)+ Ni (s)$
• C. $Co (s)+ Ni ^{2+}(a q) \longrightarrow Co ^{2+}(a q)+ Ni (s)$
• D. $Co ^{2+}(s)+ Ni (a q) \longrightarrow Co (a q)+ Ni (s)$

Answer 1

Answer: (C)

Cobalt $(Co)$ being more reactive than nickel, is oxidised to $Co ^{2+}$ and $Ni ^{2+}$ ions are reduced to $Ni$ by gaining $2 e^{-}$from $Co$.