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Chemistry

Chemistry
Besides CO2, the other green house gas is

CH4
Ar Ar
O2
N2 N2

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Auatic fungi
Evapotranspiration
Aquatic macrophytes
Effluents

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Chemistry
The two metal ions that cause hardness to water are:

Sodium, Magnesium
Sodium, Calcium
Sodium, Potassium
Calcium, Magnesium

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

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

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Chemistry
Atomic number of an atom gives the number of which of the following ?

Electrons
Protons
Neutrons and protons
Neutrons

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Chemistry
An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Helium
Krypton
Argon
Radon

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