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Chemistry

Chemistry
The most abundant constituent of atmospheric air is :

Hydrogen
Carbon
Nitrogen
Oxygen

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Chemistry
Helium gas is used in gas balloons instead of hydrogen gas because it is

More abundant than hydrogen
Non-combustible
Lighter than hydrogen
More stable

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Chemistry
'Atomic theory' of matter was given by

Avogadro
Pascal
Dalton
Newton

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Chemistry
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

4.05 gram
5.05 gram
2.05 gram
3.05 gram

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Chemistry
Brine refers to :

Sweet water
Salt water
Pure water
Starch water

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Chemistry
Silicon is used in

Solar energy devices
All of these
Transistors
Semiconductors

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MORE MCQ ON Chemistry

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