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Chemistry

Chemistry
Which one element from below list is liquid at room temperature

Zinc
Lead
Argon
Bromine

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Chemistry
Diamond is lustrous because

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

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Chemistry
The two metal ions that cause hardness to water are:

Calcium, Magnesium
Sodium, Potassium
Sodium, Calcium
Sodium, Magnesium

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Chemistry
Aluminium chloride is

Lewis Base
Arrhenius Acid
Bronsted Lowry Acid
Lewis Acid

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Chemistry
Element 106 was discovered by

Rutherford
Kurchatove
Lawrence
Seaborg

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Chemistry
Which one of the following group of gases contributes to the 'Green House Effect'?

Carbon tetraflouride and Nitrous oxide
Carbon dioxide and Methane
Carbon monoxide and Sulphur dioxide
Ammonia and Ozone

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