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Chemistry

Chemistry
Isobars are lines joining places having equal

Rainfall
Pressure
Height above sea-level
Population

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Chemistry
The most abundant element is

Calcium
Oxygen
Silicon
Nitrogen

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

5x
7.2 x
5x/36
x/6

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Chemistry
The gas causing acid rain in an industrial area is

Sulphur dioxide
Carbon monoxide
Carbon dioxide
Methane

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Chemistry
Mark the compound which possess ionic, covalent and coordinate bonds.

NH4Cl
SO3
SO2
H2O

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Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

More efficient car engines
Catalytic converters in industry
Low - sulphur fuels
Static electricity to attract it in factory chimneys

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