Litharge is $NOT$ commonly used in which of the following?

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

The standard cell potential $(E_{\text{cell}}^{\ominus})$ of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as $1.21 \ V$. The standard half-cell reduction potential for $O_2$ $(E_{O_2 / H_2 O}^0)$ is $1.229 \ V$. Choose the correct statement:

What is the correct order of chemical reactivity with water according to the electrochemical series?

If a strip of $Cu$ metal is placed in a solution of ferrous sulphate,what will happen?

Which of the following will not displace hydrogen from dilute acids?