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Chemistry

Chemistry
Air shows the property of

N2
None of these
Both A and B
O2

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Chemistry
Which method will be employed to test the hardness of water?

Formation of lather with soap
Distillation
Boiling
None of these

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Chemistry
Which of the following contains high content of lead?

High octane fuel
Low octane fuel
Coal
Cooking gas

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Chemistry
An example of replenishable energy source is–

Lignite
Petroleum
Coal
Biomass

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Chemistry
The elements in the modern Periodic table are arranged according to their

Neutron number
Mass number
Atomic Weight
Atomic number

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

Manganese
Magnesium
None of these
Calcium

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