Carbon, Compound and Petroleum

Carbon Compound and Petroleum Worksheet-1

1. Photosynthesis is the nature’s way of making food by itself, which is the source of all energy. What is the percentage of gas in atmospheric air, which is used by the plants in making food (photosynthesis)?

(a) 23.1 %          (b) 0.03 %         (c) 24.4 %          (d) 75.5 %

2. The allotropes of carbon can be differentiated on the basis of crystalline and amorphous forms. Which allotropic form of Carbon is used in making jewellery?

(a) Silver            (b) Gold             (c) Diamond     (d) Platinum

Carbon Compound and Petroleum Worksheet-2

1. 2CaO + C →  CaC₂ + 2CO

2CaC₂ + 2H₂O → (A) + (B)

If (A) is involved in the neutralization reaction with acid, then (B) may be

(a) C₂H₂             (b) CH₄              (c) Ca(OH)₂      (d) CaH₂

2. When an excess amount of CO₂ is passed through lime water, it first turns milky and then the milkiness disappears due to the formation of

(a) CaCO₃ which is soluble in H₂O

(b) CaCO₃ which is insoluble in H₂O

(c) CaHCO₃ which is soluble in H₂O

Carbon Compound and Petroleum Worksheet-3

Fill in Blanks.

1. Crystallization of carbon to form diamonds take place when ______ metal expands during solidification.

2. Carbon monoxide is slightly ______ than air.

3. The compound of carbon used to soften hard water is ____.

4. ____ acid on reaction with H₂SO₄ gives only carbon monoxide (CO).

5. Methane (CH₄) is prepared in laboratory by heating anhydrous sodium acetate with _____.

6. Sugar on reaction with _____ gives sugar charcoal.

7. Gas carbon is used as ______ in dry cell.