Chemistry 1

 

1. Which of the following is used for killing rats?

     (a) Zinc phosphide
     (b) Duralumin
     (c) Zinc oxide
     (d) Sodium nitrate

2. Which of the following is the purest form of ‘Carbon’?

     (a) Charcoal
     (b) Granite
     (c) Diamond
     (d) Graphite

3. What is baking soda?

     (a) Potassium permanganate
     (b) Sodium bicarbonate
     (c) Sodium chloride
     (d) Sodium carbonate

4. Bronze is an alloy of copper and ___

     (a) zinc
     (b) nickel
     (c) tin
     (d) aluminium

5. ‘Gypsum’ is an ore of

     (a) Iron
     (b) Calcium
     (c) Sodium
     (d) Magnesium

6. Natural rubber is polymer of-

     (a) Isobutane
     (b) Propane
     (c) Isopropene
     (d) Isoprene

7. Which of the two metals are mixed in manufacturing stainless steel?

     (a) Zinc, Chromium
     (b) Nickel, Chromium
     (c) Chromium, Iron
     (d) Nickel, Iron

8. Which gas is evolved during photosynthesis in plants?

     (a) Carbon dioxide
     (b) Nitrogen
     (c) Hydrogen
     (d) Oxygen

9. Why is ozone layer important to mankind?

     (a) It creates a protective covering against ultraviolet rays
     (b) It remains the temperature of earth
     (c) It release oxygen in the atmosphere
     (d) It release carbon dioxide in the atmosphere

10. Which of the following is always present in organic compounds?

     (a) Carbon
     (b) Nitrogen
     (c) Sulphur
     (d) Potassium

 

 

Answer: (1) a (2) c (3) b (4) c (5) b (6) d (7) c (8) d (9) a (10) a