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Chemistry

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

Hydrogen
Chlorine
Nitrogen
Oxygen

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Chemistry
Alum is used as

An analgesic
A purifier for water
A fertilizer
A disinfectant

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Chemistry
Which one of the following is a greenhouse gas ?

Carbon dioxide
Sulphur dioxide
Helium
Nitrogen

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Chemistry
White phosphorus is generally kept under

Kerosene oil
Water
Glycerine
Alcohol

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Chemistry
The element used in the manufacture of safety matches is

Magnesium
Phosphorous
Sulphur
Silicon

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Chemistry
Which of the following is the correct sequence of countries in terms of maximum carbon dioxide emission?

USA, India, China, European Union
China, India, European Union, USA
China, USA, European Union, India
European Union, China, USA, India

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