Which of the following methods are not used to refine any metal?

A. Liquation

B. Calcination

C. Electrolysis

D. Leaching

E. Distillation

Choose the correct answer from the options given below:

Given below are two statements.

Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.

Statement II : Density of hydrogen peroxide at $$298 \mathrm{~K}$$ is lower than that of $$\mathrm{D}_{2} \mathrm{O}$$.

In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements.

Statement I: The chlorides of $$\mathrm{Be}$$ and $$\mathrm{Al}$$ have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.

Statement II: Hydroxides of $$\mathrm{Be}$$ and $$\mathrm{Al}$$ dissolve in excess alkali to give beryllate and aluminate ions.

In the light of the above statements, choose the correct answer from the options given below.

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?