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Chemistry

Chemistry
Total number of halogen elements found in the periodic table is

3
13
5
8

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Chemistry
The main active constituent of tea and coffee is

aspirin
chlorophyll
caffeine
nicotine

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Chemistry
In upper layer of atmosphere ozone is formed by

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

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Chemistry
Solder metal is an alloy of

Lead and tin
Copper and zinc
Copper and tin
Lead and antimony

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Chemistry
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is

All of them
Hydrogen
Oxygen
Carbon dioxide

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Chemistry
Nucleus of an atom consists of.

Proton and Neutron
Neutron
Electron, Proton and Neutron
Proton

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MORE MCQ ON Chemistry

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