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Chemistry

Chemistry
Which one of the following is a micro-element ?

Chlorine
Hydrogen
Nitrogen
Oxygen

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Chemistry
Formation of ozone hole is maximum over

Africa
India
Antarctica
Europe

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Chemistry
In drinking water supply, which of the following treatments is not involved

Softening
Sedimentation
Disinfection
Coagulation

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Pneumoconiosis
Asthma
Silicosis
Cancer

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Chemistry
How many neutrons does iron have

8
30
26
13

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Chemistry
Which of the following is ozone depleting pesticide ?

Methyl bromide
D.T.
Ethylene ozonide
Benzene

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