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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Iron
Magnesium
Silicon

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Chemistry
The compound that has the least value for octane number is :

2,2-dimethyl hexane
N-heptane
2-methyl heptane
Iso-octane

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Chemistry
Which of the following is not a gaseous air pollutant?

Oxides of sulphur
Hydrocarbon
Oxides of nitrogen
Smoke

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Chemistry
Nitric acid does not react with

Zinc
Copper
Iron
Gold

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Chemistry
Petroleum is a mixture of

Elements
Salts
Polymers
Hydrocarbons

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Chemistry
Poison used for killing rats is

Zinc phosphide (Zn3P2)
Calcium phosphide (Ca3P2)
Magnesium phosphide (Mg3P2)
Magnesium nitride (Mg3N2)

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