Which of the following aqueous solutions of salts will have highest $$\mathrm{pH}$$ value?

Which among the following compounds represents a soap molecule?

How long will it take to produce $$5.4 \mathrm{~g}$$ of $$\mathrm{Ag}$$ from molten $$\mathrm{AgCl}$$ by passing $$5 \mathrm{~amp}$$ current?

(Molar mass Ag = $$108 \mathrm{~g} \mathrm{~mol}^{-1}$$ )

Which of the following is NOT an example of secondary voltaic cell?