true or false. [1 M]

Question 11 Mark

State whether the following statements are true or false: Coke is almost pure form of carbon.

Answer

True Explanation: It is a tough, porous and black substance. It is almost pure form of carbon.

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Question 21 Mark

State whether the following statements are true or false: Kerosene is not a fossil fuel.

Answer

False Explanation: Kerosene is a fossil fuel. It is used as a fuel for stoves, lamps and for jet aircrafts.

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Question 31 Mark

State whether the following statements are true or false: Coal tar is a mixture of various substances.

Answer

True Explanation: Coal tar is the product of coal which is a thick black liquid having an unpleasant smell. It is a mixture of about 200 substances.

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Question 41 Mark

State whether the following statements are true or false: $CNG$ is more polluting than petrol.

Answer

$CNG$ is less polluting than petrol. It is a clean burning fuel. It produces $45\%$ less hydrocarbons than petrol.

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Question 51 Mark

State whether the following statements are true or false: Fossil fuels can be made in the laboratory.

Answer

False Explanation: The formation of fossil fuels is a very slow process. These are formed under very high pressure and high temperature. The conditions for their formation cannot be created in the laboratory.

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Science true or false. [1 M]

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