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Chemistry

Chemistry
Alum stops bleeding in minor cuts because of

Dialysis
Solvation
Coagulation
Emulsion

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Chemistry
Among the following, which is always found in free-state in nature?

Silver
Gold
Copper
Sodium

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Chemistry
Which of the following is used in making smoke bombs?

Hydrogen
Phosphorus
Carbon
Sulphur

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

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

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Chemistry
Spontaneous change is one in there is:

A lowering of entropy
An increase in Internal energy
Increase in free energy
A lowering of free energy

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Chemistry
Which one of the following is extensively used for sterilizing water ?

Bleaching powder
Alum
Soda powder
Borax powder

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