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Chemistry

Chemistry
The main active constituent of tea and coffee is

chlorophyll
caffeine
nicotine
aspirin

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Chemistry
Which among the following is a covalent compound ?

Magnesium fluoride
Carbon tetrachloride
Calcium chloride
Sodium chloride

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Chemistry
When water itself combines chemically with some element or mineral it is called

Hydration
Desilication
Carbonation
Oxidation

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Chemistry
Which of the following has the highest lattice energy

CsF
NaF
KF
RbF

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Chemistry
Molality of pure water is

18
55.5
1.8
5.55

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Chemistry
In upper layer of atmosphere ozone is formed by

The action of nitrogen on oxygen in atmosphere
The combination of oxygen molecules
The action of ultraviolet rays on oxygen
Subjecting oxygen to high pressure

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