What happens when:
a. Hot and concentrated NaOH solution reacts with `I_(2)`.
b. White phosporus is heated with caustic soda.
c. Excess of caustic soda reacts with zinc sulphate solution.
d. Excess of caustic soda is added to `AICI_(3)` solution.
e. Sodium is heated strongly in oxygen and the product is treated with `H_(2)SO_(4)`.

Explanation

a. `underset("conc solution")underset("Hot and")(2NaOH)+I_(2)rarr NaI+NaIO+H_(2)O`
b. `underset("phosphorous")underset("White")(P_(4))+3NaOH+3H_(2)O rarr underset("hypophosphite")underset("Sodium")(3NaH_(2)PO_(2))+underset("Phosphine")(PH_(3))`
c. `2NaOH+ZnSO_(4)rarr underset("Sulphate")underset("Sodium")(Na_(2)SO_(4))+underset("hydroxide")underset("Zinc")(Zn(OH)_(2))`
d. `2NaOH+AICI_(3(aq))rarrAI(OH)_(3)+3NaCI`
e. `Na+O_(2)overset(Delta)rarr Na_(2)O_(2) (Sodium peroxide)`
`Na_(2)O_(2)+H_(2)SO_(4)rarr underset("sulphate")underset("Sodium")(Na_(2)SO_(4))+underset("peroxide")underset("Hydrogen")(H_(2)O_(2))`