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Chemistry

Chemistry
Which of the following is used in making smoke bombs?

Phosphorus
Carbon
Sulphur
Hydrogen

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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
Impure camphor is purified by

Steam distillation
Fractional crystallisation
Sublimation
Fractional distillation

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Chemistry
Threshold limit value of copper in the atmospheric air is

0.01 mg/m3
0.001 mg/m3
1.0 mg/m3
5.0 mg/m3

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Chemistry
The coloured discharge tubes for advertisement mainly contain

Xenon
Argon
Neon
Helium

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Chemistry
Which among the following is a covalent compound ?

Sodium chloride
Calcium chloride
Carbon tetrachloride
Magnesium fluoride

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