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Chemistry

Chemistry
The main active constituent of tea and coffee is

chlorophyll
caffeine
nicotine
aspirin

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Chemistry
The gas used in the manufacture of vanaspati from vegetable oil is

carbon dioxide
oxygen
nitrogen
hydrogen

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Chemistry
What are the major pollutants of cigarette smoke?

Carbon monoxide and dioxin
Carbon monoxide and benzene
Dioxin and benzene
Carbon monoxide and nicotine

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Chemistry
Liquid Nitrogen boils at

97 Kelvin
77 kelvin
82 Kelvin
54 kelvin

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Chemistry
Hard water and soft water can be distinguished by using

Detergent
Dilute acid
Liquid soap
Ordinary soap

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Chemistry
Which of the following is not a method of preparing oxygen?

Decomposition of potassium permanganate
Decomposition of manganese dioxide
Electrolysis of water
Fractional distillation of liquid air

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MORE MCQ ON Chemistry

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