Explain the following in one or two sentences.

Explain the following in one or two sentence only: 'Phenol is an acid, but it does not react with sodium bicarbonate'.

Explain the following in one or two sentances only : "Orthophosphorous acid is not a tribasic acid".

Explain the following in one or two sentances only : "Orthophosphorous acid is not a tribasic acid".

Answer the following in one or two sentences What is reactivity series of metals?

Answer the following in one or two sentences What is the purpose of roasting in metallurgy?

Answer the following in one or two sentences What is meant by corrosion?

Answer the following in one or two sentences What is the principle of froth floatation process?

Answer the following in one or two sentences What is the nature of the oxides of metals?

Answer the following in one or two sentences What is the principle of magnetic separation method?