Name the inert gases used for :
(i) Filing sodium vapour lamps.
(ii) Obtaining ligth of different colours in neon signs.

The spectrum obtained from a sodium vapour lamp is an example of

Name the method used for the refining of (i) nickel (ii) Titanium.

Name the instruments used for measuring - (i) pulse and (ii) blood pressure.

Name the method used for the refining of (i) nickel (ii) zirconium.

Write the name of the monomers used for getting the following polymer (i) Bakelite (ii) Neoprene

(i)Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process. (ii) Write the equation for the reaction where the aluminum oxide for the electrolytic extraction of aluminum is obtained by heating aluminium hydroxide.

Answer the following questions: (i) Why are vitamin A and vitamin C essential for us? (ii) What is the difference between a nucleoside and a nucleotide?

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen ? (ii) why is the light of a single colour used ?

Name one other element for each which is in the same group as (i) carbon (ii) fluorine (iii) sodium

(i) What is a protoplast ? (ii) Name the two enzymes used in producing protoplasts. (iii) Mention the usefulness of somatic hybridisation.