Which of the following substances is used in a dry cell?

Consider the Galvanic cell $Zn|ZnSO_4||CuSO_4|Cu$. The reaction at the cathode is

For the electrochemical cell,$M|M^{+}||X^{-}|X,$ given $E^{\circ}(M^{+}|M) = 0.44 \; V$ and $E^{\circ}(X|X^{-}) = 0.33 \; V$. From this data,one can deduce that:

In a galvanic cell,the salt bridge is used to:

What are reactive electrodes and inert electrodes? Give examples.

Zinc displaces copper from the solution of its salt because