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Chemistry

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

Aluminium
Water
Cast-iron
Type metal

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Chemistry
Which of the following produces highest amount of energy upon oxidation?

An alkane
Fat
Protein
Glucose

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Chemistry
Total number of halogen elements found in the periodic table is

8
13
5
3

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Chemistry
Which among the following elements is found in maximum percentage in the human body ?

Hydrogen
Oxyzen
Nitrozen
Carbon

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Chemistry
The depletion in Ozone layer is caused by ________ .

Methane
Nitrous oxide
Carbon dioxide
Chlorofluorocarbons

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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
More stable
Lighter than hydrogen

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