When a piece of copper wire is dipped in $AgNO_3$ solution,the colour of the solution turns blue due to

Write a note on mercury cell $(Zn-Hg)$.

In a fuel cell,$H_2$ and $O_2$ react to produce electricity. In this process,$H_2$ gas is oxidized at the anode and $O_2$ gas is reduced at the cathode. If $67.2 \ L$ of $H_2$ gas at $\text{STP}$ is consumed in $15 \ min$,what is the current produced (in $A$)?

Write the chemistry of recharging the lead storage battery,highlighting all the materials that are involved during recharging.

Which of the following acts as an oxidising agent in a hydrogen-oxygen fuel cell?

The cell reaction $Mn + 2Ag_{(C_1)}^{+(aq)} \to Mn_{(C_2)}^{+2_{(aq)}} + 2Ag$ is represented by