What is the function of the moderator and the control rod in nuclear reactor ? 

Correct the following statements :

For water-system, the number of phases that can exist in equilibrium is two.

Complete the following statements by selecting the correct alternative from the choices given :

Mac Arthur-Forrest process is used for the extraction of:

Fill in the blanks choosing appropriate words given in brackets : 

[Olefenic, aldol, safety matches, sodium sulphite, homolytic, organometallic, aldol condensation, flowers of sulphur, pesticides, heterolytic, antiknock, β-hydroxy-aldehyde, rat poison, sulphur dioxide, free radicals, antichlor, mixed condensation, photography, sodium hydroxide, charged species].

(i) Red phosphorus is used in the manufacture of______and________.

(ii) Hypo is prepared by boiling________solution with_________in alkaline medium.

(iii) The breaking of covalent bonds may be either through_______or by________fission.

(iv) Acetaldehyde in presence of dilute alkali gives_______and the reaction is called______.

(v) TEL, an_______compound, is used as an________agent.

(i) Write the equation which relates the number of phases, components and degree of freedom of a system in equilibrium.    

(ii) How many phases and components are there in a system consisting of:

(1) a mixture of O₂ and N₂ gases

(2) N₂ gas containing H₂O vapour

(3) a mixture of ice and water

(4) a mixture of powdered iron and sulphur

(5) a lump of solid iron (II) sulphide

Give a suitable explanation, in brief, for your answer.