Assertion : Copper sulphate can be stored in zinc vessel.

Reason : Zinc is less reactive than copper.

(iv) Both assertion and reason are false.

Cu²⁺ + 2e^-→ Cu_(S) E° = 0.34V

Zn²⁺ + 2e^-→ Zn_(S) E° = -0.76V

Overall reaction,

Cu²⁺ + Zn_(S) → Cu_(S) + Zn²⁺ ; E° = 0.34V – (-0.76V) = + 1.1V

Copper (Cu²⁺) sulphate can’t be stored in zinc vessel as Zinc is more reactive than Copper. Clearly, one can say that Zinc is a stronger reducing agent than Copper. Thus, Zinc donate electrons to Cu²⁺ and the above radox reaction occurs.