Chemistry solved MCQs

1 of 50

1. What is "milk of magnesia" chemically?

a. Magnesium carbonate

B. Sodium bicarbonate

c. Calcium hydroxide

d. Magnesium hydroxide

2. The acid used in lead storage cells is –

a. phosphoric acid

B. hydrochloric acid

c. nitric acid

d. sulphuric acid

3. Milk tastes sour when kept in the open for sometime due to the formation of –

a. lactic acid

B. citric acid

c. acetic acid

d. carbonic acid

4. Which of the following is a natural dye?

a. Crystal violet

B. Aniline blue

c. Alizarin

d. Phenolphthalein

5. The ratio of pure gold in 18 carat gold is

a. 60%

B. 75%

c. 80%

d. 90%

6.                is the process in which acids and bases react to form salts and water.

a. Neutralization

B. Electrolysis

c. Distillation

d. Hydrolysis

7. The gas usually causing explosions in coal mines is –

a. Hydrogen

B. Carbon monoxide

c. Air

d. Methane

8. Which is the purest form of iron?

a. Steel

B. Cast iron

c. Pig iron

d. Wrought iron

9. Which of the following metals form an amalgam with other metals?

a. Lead

B. Tin

c. Zinc

d. Mercury

10. Petroleum is a mixture of –

a. elements

B. hydrocarbons

c. polymers

d. salts

11. The gas used for filling weather balloons is –

a. helium

B. hydrogen

c. air

d. nitrogen

12. An emulsion is a colloid of a –

a. gas in a liquid

B. liquid in a liquid

c. liquid in a gas

d. gas in a solid

13. Percentage of carbon in steel ranges from –

a. 0.1 to 1.5

B. 1.5 to 3.0

c. 3.0 to 4.0

d. 4.0 to 6.0

14. Which of the following gases makes bread or cake rise making them soft and spongy?

a. CO

B. H2

c. CO2

d. O2

15. Candle is a mixture of –

a. Paraffin wax and stearic acid

B. Bees wax and stearic acid

c. Higher fat acids and stearic acid

d. Bees wax and paraffin wax

16. German silver, an alloy, does not contain the metal –

a. Nickel

B. Zinc

c. Copper

d. Silver

17. Oxygen which is vital for life is a product of photosynthesis and comes from –

a. carbonates from soil

B. carbon dioxide

c. water

d. oxides of mineral elements

18. What is the purpose of adding baking soda to dough?

a. To generate moisture

B. To give a good flavour

c. To give good colour

d. To generate carbon dioxide

19. Gobar gas mainly contains –

a. Carbon dioxide

B. Carbon monoxide

c. Hydrogen sulphide

d. Methane

20. The chief constituent of vinegar is –

a. Formic acid

B. Acetic acid

c. Salycylic acid

d. Oxalic acid

21. Commercial Vaseline is derived from -

a. plant gums

B. coal tar

c. wool wax

d. petroleum

22. Colour imparted to the Bunsen flame by strontium salt is -

a. bluish green

B. apple-green

c. brick red

d. crimson red

23. Name the particle that is most essential to continue the chain reaction during the fission of uranium -

a. Electron

B. Proton

c. Neutron

d. Positron

24. Which one amongst the following is not a Green House gas?

a. Nitrogen

B. Carbon dioxide

c. Carbon Monoxide

d. Chloro fluoro carbons

25. The element used in the manufacture of safety matches is –

a. Phosphorous

B. Magnesium

c. Silicon

d. Sulphur

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