KCET 2025 Chemistry Paper

The correct choice is C : (a) and (d) only. Here's why:
In a galvanic (voltaic) cell
The anode is where oxidation occurs and is the negative terminal.
The cathode is where reduction occurs and is the positive terminal.
⇒ (b) "Anode is positive" is false, (d) "Cathode is positive" is true.
Conventional current (flow of positive charge) goes from cathode to anode through the external circuit.
⇒ (a) is true.
A negative cell potential means the reaction is non-spontaneous:
E‌cell ‌<0⟹ non-spontaneous
⇒ (c) is false.