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Chemistry

Chemistry
Atomic number is the number equal to

Neutrons
None of these
Protons
Electrons

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Chemistry
An emulsifier is an agent which

Homogenises an emulsion
Stabilises an emulsion
Aids the flocculation of an emulsion
Accelerates the dispersion

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Chemistry
The mass of one Avogadro number of helium atom is

1.00 gram
4.00 gram
8.00 gram
4 x 6.02 x 1023 gram

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Chemistry
Oxygen which is vital for life is a product of photosynthesis and comes from

Water
Carbonates from soil
Oxides of mineral elements
Carbon dioxide

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Chemistry
Which of the following gases is most toxic ?

Carbon dioxide
Carbon monoxide
Chlorine
Sulphur dioxide

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Chemistry
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

1 : 16 : 2
1 : 1 : 1
2 : 16 : 1
2 : 16 : 2

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