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Chemistry

Chemistry
Among the fuels given below, the one with highest calorific value is

Coal
Coke
Wood
Natural gas

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Chemistry
Which one is a naturally occuring noble gas

Argon
Sodium
Potassium
Boron

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Chemistry
Diamond is harder than graphite because of :

Tetrahedral structure of diamond
Difference of crystalline structures
Difference in layers of atoms
None of these

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Chemistry
What is the chemical symbol of mercury

Mg
None of these
Hg
Mr

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Chemistry
In an oxygen molecule, two atoms are united by

One bond
Two bonds
Three bonds
Four bonds

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Chemistry
Select the one which is not a mixture :

LPG
Gasoline
Distilled water
Air

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