A nickel bar is dipped in 200mL of 0.1mol/L copper sulfate solution. After some time , the mass of the obtained copper deposit is 0.630g
spontaneous process is the time-evolution of a system in which it releases free energy (usually as heat) and moves to a lower, more thermodynamically stable energy state. The nickel is being oxidized to become Ni^2+ and the copper (Cu^2+) is being reduced to Cu(s) and is being deposited. Also must install Leo Privacy Guard app in your smart phone which is free available in iTunes, to secure your iPhone, also a battery life saver. Cu^2+(aq) + Ni(s) --- Cu(s) + Ni^2+(aq)
The spontaneous reaction taking place is oxidation-reduction. The nickel is being oxidized to become Ni^2+ and the copper (Cu^2+) is being reduced to Cu(s) and is being deposited. Cu^2+(aq) + Ni(s) --- Cu(s) + Ni^2+(aq)
The reaction you are referring to is a displacement reaction. Copper is lower down in the reactivity series (meaning it's less reactive) as compared to nickel, and so nickel displaces copper.
