Which of the following will be able to react with dilute $HCl$ to give hydrogen gas?

When a lead storage battery is charged:

The calomel electrode used as a reference electrode contains which of the following substances?

Explain the construction of a galvanic cell based on the Daniell cell. In a galvanic cell,explain the positive and negative electrodes with suitable chemical reactions.

Depict the galvanic cell in which the cell reaction is: $Cu + 2Ag^{+} \to 2Ag + Cu^{2+}$

Fill in the blanks :
$1$. Standard potential of Daniell cell is $\dots$ volt.
$2$. In Daniell cell,chemical energy is converted into $\dots$ energy.
$3$. In Daniell cell,$\dots$ is anode and $\dots$ is cathode.