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Chemistry

Chemistry
The main active constituent of tea and coffee is

aspirin
chlorophyll
nicotine
caffeine

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Chemistry
The presence of ozone in the stratosphere is responsible for

Increasing the average global temperature in recent years
Checking the penetration of ultra-violet rays to the earth
Higher rate of photosynthesis
Supplying oxygen for people travelling in jets

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Chemistry
The common name for the compound having formal NaOH is

Sodium hydroxide
Caustic soda
Caustic potash
Soda ash

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Chemistry
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?

Ethane
Propane
Butane
Methane

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Chemistry
Neoprene is prepared by polymerisation of which of the following

2-chloro-1, 3-butadiene
1,3-butadiene
2-methyl 1, 3-butadiene
Acrylonitrile

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Chemistry
Which of the following has no unit

Ionization energy
Excitation potential
Electronegativity
Electron affinity

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