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Chemistry

Chemistry
The element with highest ionization potential is

Helium
Oxygen
Boron
Carbon

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Chemistry
The gas that usually causes explosions in coal mines is

Methane
Hydrogen
Carbon monoxide
Air

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

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

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Chemistry
CNG used in automobiles to check pollution, mainly consists of

H2
CO2
CH4
N2

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Chemistry
Hydrogen is not found in atmosphere because

It is highly inflammable
It is absorbed by plants
It is the lightest gas
It immediately combines with oxygen to form water

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Chemistry
Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

Calcium
Magnesium
None of these
Manganese

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