Which of the following is a super cooled liquid ? 1). Ice Cream 2). Teflon 3). Glass 4). Mercury
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1. Helium gas is filled in ballons because
2. Main pollutan present in?automobile exhaust is-
3. Stainless steel is usually made by alloying the steel with
4. Acid rain is caused due to pollution of atmosphere by
5. 'Vinegar' is a commercial name of
6. Question 11.27:In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.
7. Question 16.11:Why are cimetidine and ranitidine better antacids than sodium hydrogen carbonate or magnesium or aluminium hydroxide?
8. Question 15.12:Write the monomers used for getting the following polymers.(i) Polyvinyl chloride (ii) Teflon (iii) Bakelite
9. Colloids can be purified by
10. The most important ore of lead is
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