Chemistry MCQ 002

Chemistry MCQ 002

1. The presence of dust particles in air serves

(A) as a nucleus to condense water vapour resulting in rain

(B) to maintain the average density of air

(C) to minimise the inflammatory nature of oxygen

(D) to protect the inhabitants of the earth from the effects of ultra violet rays.

2. Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the

(A) Law of Multiple Proportions

(B) Law of Definite Proportions

(C) Law of Conservation of Mass

(D) Law of Reciprocal Proportions

3. The substance most abundantly found in sea water is

(A) magnesium chloride

(B) sodium chloride

(C) calcium sulphate

(D) potassium chloride

4. The compounds produced by plants in the process of photosynthesis are

(A) carbohydrates

(B) proteins

(C) salts

(D) fats

5. In the common soda-acid fire extinguisher, the fire is put out by

(A) acid fumes

(B) sodium bicarbonate

(C) carbon dioxide

(D) sodium carbonate

6. The substance preserved under water is

(A) potassium

(B) sodium   

(C) red phosphorus

(D) white phosphorus

7. The metal which reacts most violently with cold water is

(A) calcium

(B) sodium

(C) magnesium

(D) potassium

8. Clark’s method for removal of temporary hardness in water uses

(A) calcium hydroxide

(B) washing soda

(C) calcium chloride

(D) zeolite

9. Suspended impurities in water are effectively removed by

(A) adding milk of lime

(B) filtering through sand

(C) adding filter alum

(D) chlorination

10. Heavy water was discovered by

(A) TW Richards

(B) FW Aston

(C) Stas

(D) Urey

Answers

1. A

2. B

3. B

4. A

5. C

6. D

7. D

8. A

9. C

10. D

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