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Chemistry

Chemistry
Which one of the following elements is an example of noble gas ?

Helium
Hydrogen
Chlorine
Nitrogen

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Chemistry
Which one of the following is a greenhouse gas ?

Helium
Carbon dioxide
Sulphur dioxide
Nitrogen

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Chemistry
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

4
2
5
zero

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Chemistry
The three elements most needed in common fertilisers are :

Calcium, Phosphorous and Potassium
Nitrogen, Potassium and Phosphorous
Phosphorous, Sodium and Nitrogen
Sulphur, Phosphorous and Sodium

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Chemistry
The chemical that is used to ripen mangoes is

Calcium chloride
Calcium carbonate
Calcium carbide
Calcium sulphide

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Chemistry
The material used in the manufacture of lead pencil is

Carbon
Graphite
Mica
Lead

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MORE MCQ ON Chemistry

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