Question

When Daniell cell is opening, _____ .
(a) volume of Zn-rod increases and the colour of CuSO4 solution becomes deep blue
(b) concentration of Zn2+ increases and that of Cu2+ decreases
(c) decrease in the weight of Zn-anode = Increase in the weight of Cu-cathode
(d) the solution of NH4NO3 is to be filled again in the salt bridge after a long time

Answer 1

Answer:

In Daniell cell, the cell emf is directly proportional to the ratio of the concentration of the Cu

2+

and Zn

2+

;

so, on increasing the concentration of both ions, the ratio will remain constant and hence the emf will also be constant;

but electrode potential is directly proportional to the concentration of metal ion;

so, assertion is incorrect but the reason is correct.