Q69 of 87 Page 107

Which of the following is the most environment friendly fuel to be used in automobiles?

The use of petrol and diesel as fuels in automobiles is being replaced by CNG because it produces very small amount of harmful gases.

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67

Which of the following is the main cause of global warming?

 68

Which of the following gas does not contribute to the formation of an acid rain?

 70

Which of the following does not involve a combustion reaction?

 71

A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because: