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Chemistry

Chemistry
The substance which does not expand on going from liquid state to solid state is

Aluminium
Type metal
Cast-iron
Water

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Chemistry
Helium is added to the oxygen supply of deep sea divers because it is

Less poisonous than nitrogen
Lighter than nitrogen
Less soluble in blood than nitrogen at high pressure
Readily miscible with oxygen

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Chemistry
'Vinegar' is a commercial name of

Hydrochloric acid
Oxalic acid
Acetic acid
Citric acid

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Chemistry
Cement containing excess amount of lime

Is quick setting
Becomes more strong
Cracks during setting
Is slow setting

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Chemistry
In vulcanisation process, rubber can be hardened by adding

Alcohol
Nitrogen
Sulphur
Silicon

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Chemistry
The most commonly used chemicals in the artificial rainmaking or cloud seeding are

Dry Ice (Frozen CO2)
All of these
Silver Iodide (Ag I)
Sodium Chloride (NaCl)

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