Carbon Silicon and Their Compounds - 2

Carbon Silicon and Their Compounds - 2

1. Calcium bicarbonate is insoluble in water.

a) True b) False

2. Bucky balls act as semi conductors and lubricants.

a) True b) False

3. Formula of dolomite is MgCO₃.

a) True b) False

4. Carbon monoxide is used for extraction of metals from their ores.

a) False b) True

5. Tridymite is allotropic form of carbon.

a) False b) True

6. Which of the following is amorphous form of carbon

a) Graphite b) Buckyballs

c) Diamond d) Charcoal

7. Essential constituent of all organic compounds is

a) Hydrogen b) Carbon

c) Nitrogen d) Oxygen

8. In the structure of diamond each carbon atom is bonded by

a) Covalent bond b) Electrostatic force of attraction

c) Ionic bond d) Coordinate covalent

9. Charcoal absorbs gases as well as other impurities from many materials due to

a) Density b) Volume

c) Large surface area d) Rough surface

10. All crystalline and amorphous form of carbon except diamond have colour

a) Pale b) White
c) Greyish black d) Black

11. When carbon dioxide is passed through lime water it turns milky due to the formation of insoluble

a) Calcium oxide b) Calcium phosphate

c) Calcium carbonate d) Calcium nitrate

12. Soda water drink contain

a) Carbon dioxide b) Oxygen

c) Carbon monoxide d) Nitrogen dioxide

13. Carbon monoxide combines with chlorine to form phosgene in the presence of

a) Sunlight b) H₂/Pd catalyst

c) Ni catalyst d) FeCl₃

14. Substances whose electrical conductivity increases by increasing temperature are called

a) Super conductors b) Semi conductors

c) Conductor d) Non-conductors

15. Amethyst is a quartz that has colour due to impurities

a) Red b) Green

c) Violet d) Blue

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