Answer to Question #250161 in Chemistry for zayed

Question

Which of the following statements is(are) true for all voltaic (or galvanic) cells?

(I) Reduction occurs at the cathode.

(II) The anode gains mass during discharge (note: this means operation of the cell.)

 III) The voltage is less than or equal to zero. 

Answer 1

Solution:

(I) Reduction occurs at the cathode. - TRUE

(II) The anode gains mass during discharge. - FALSE.

At anode oxidation takes place which means electrons pass out to the solution in a electrochemical cell i.e. it corrodes the electrode or electrode experiences mass loss.

(III) The voltage is less than or equal to zero. - FALSE.

The voltage may also be positive/greater than zero which actually depends upon the species used in the electrochemical recation.

Thus, the correct answer is only (I).

Answer: Only (I)