Benzonitrile on reduction with stannous chloride in presence of hydrochloric acid followed by acid hydrolysis forms,

Identify from following salts so that the solubility of salt in water decreases with increase in temperature.

Which from following polymers is obtained by condensation polymerisation method?

For a Galvanic cell consisting zinc electrode and standard hydrogen electrode,

$$ \mathrm{E}^{\mathrm{o}}\left(\mathrm{Zn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Zn}_{(\mathrm{s})}\right)=-0.76 \mathrm{~V} $$

Identify the reaction that takes place at positive electrode during working of cell?