Which of the following can act as an electrolyte?
aq. NaCl
aq. CuSO4
An electrolyte dissociates to ions when electricity is passed through it. NaCl (solid) doesn't to ions when electricity is given to it and copper allow electricity to pass through it but it doesn't dissociate to ions when electricity is passed through it.
aq. NaCl and aq. CuSO4 dissociate to ions when electricity is passed through it. So, these can act as an electrolyte.