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Chemistry

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

Copper
Sodium
Gold
Silver

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Chemistry
Diamond is lustrous because

It is pure
It is hard
It is colourless
Its refractive index is high

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Chemistry
The major constituent of gobar gas is

Butane
Carbon dioxide
Isobutane
Methane

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Chemistry
At room temperature, the metal that remains liquid is:

Mercury
Lead
Platinum
Zinc

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Chemistry
A thick paste of cement, sand and water is called

Mortar
Concrete
Kiln
R.C.C.

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

O2
N 2
He
H2

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