1. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is
(a) Neon
(b) Krypton
(c) Argon
(d) Helium
2. From which mineral is radium obtained —
(A) Limestone
(B) Haematitie
(c) Pitchblende
(D) Rutile
3. Polyvinylchloride on burning give fumes of
(a) HCl
(b) Cl2
(c) H2
(d) None of these
4. Which of the following is the best conductor of electricity:
(a) Gold
(b) Silver
(c) Copper
(d) Iron
5. Find the odd one.
(a) Marble
(b) Chalk
(c) Limestone
(d) Slaked lime
6. Amides can be converted to amines by the reaction named
(a) Perkin
(b) Claisen
(c) Hoffman
(d) Clemmesen
7. The base used as an antacid is
(a) Calcium hydroxide
(b) Barium hydroxide
(c) Magnesium hydroxide
(d) Silver hydroxide
8. A process which is not helpful in the prevention of rusting of iron is
(a) annealing
(b) applying grease
(c) galvanising
(d) painting
9. Denatured alcohol
(a) is a form of alcohol
(b) is unfit for drinking as it contains poisonous substances
(c) contains coloured impurities
(d) is sweet to taste
10. Phenolics as pollutants can be removed from waste water by use of
(a) Ion exchange resin technique
(b) Electrolyte decomposition technique
(c) Reverse osmosis method
(d) Polymeric adsorbents
Note : Answers will be updated tomorrow.........
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