Arrange according to the instructions given in bracket:
`Mg^(2+), Cu^(2+), Na^(+), H^(+)` (In the order of preferential discharge at the cathode )

Arrange the as per he instruction given in the bracket: Zn ^(2+) , N a ^(+) , Cu ^(2+) [order of preference of discharge at the cathode]

Arrange the following according to the instruction given in bracket : K, Pb, Ca, Zn [In the increasing order of reactivity].

Arrange the following as per the instructions given in the brackets : Mg, Cl, Na, S, Si (decreasing order of atomic size).

Arrange the following as per the instructions given in the brackets : Cs, Na, Li, K, Rb (increasing order of metallic character).

Arrange the following as per the instructions given in the brackets: Cs, Na, Li, K, Rb (increasing order of metallic character).

Arrange according to the instructions given in bracket: Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight) [H = 1, C = 12]

Arrange the following as per instructions given in the brackets: Cl, F, Br, I (increasing order of electron affinity)

Arrange the following as per the instructions given in the brackets : Na, K, Cl, S, Si (increasing order of ionization energy).