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Chemistry

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

Water
Aluminium
Type metal
Cast-iron

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Chemistry
Browning of paper in old books is caused by

Frequent use
Lack of aeration
Collection of dust
Oxidation of cellulose

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Chemistry
Bleaching powder is prepared by passing :

Carbon dioxide over slaked lime
Chlorine over quick lirne
Oxygen over slaked lime
Chlorine over slaked lime

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Chemistry
When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocating of pond that does not leave enough oxygen needed to support life. This type of pollution is called

None of these
Eutrophication
Green house effect
Smog

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Chemistry
The process which does not evolve CO2 in air is

Burning
Organic delay
Breathing
Photosynthesis

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Chemistry
Stalactites and Stalagmites form due to the precipitation of :

MgCO3
CaCl2
CaCO3
MgCl2

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MORE MCQ ON Chemistry

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