Class 10 Chemistry Certification MCQs – Practice Test 11 (Chapter 6)

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MCQ 51: Which of the following makes up most of the air?

nitrogen
oxygen
carbon dioxide
helium

MCQ 52: Which of the following is true about nitric oxide?

it is colorless
it has an irritating odor
it is not toxic
it is not harmful

MCQ 53: Presence of which of the following can be felt near the photocopier, television set, microwave oven, etc.?

chlorofluorocarbons (chlorofluorocarbons (CFCs))
methane
ozone
lead compounds

MCQ 54: The extension of troposphere above the Earth's surface is:

12 km
50 km
80 km
70 km

MCQ 55: The energy of sunlight is converted into heat by:

oxygen only
nitrogen only
hydrogen
oxygen and nitrogen

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