Which among following salts shows decrease in solubility with increase in temperature?

Find the number of faradays of electricity required to produce $$45 \mathrm{~g}$$ of $$\mathrm{Al}$$ from molten $$\mathrm{Al}_2 \mathrm{O}_3$$.

(At. mass of $$\mathrm{Al}=27$$ )

Identify the reagent that confirms the presence of five $$-\mathrm{OH}$$ groups in glucose.

What is the concentration of $$\mathrm{OH}^{-}$$ ion in a solution containing $$0.05 \mathrm{~M} \mathrm{~H}^{+}$$ ions?