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Chemistry

Chemistry
In an oxygen molecule, two atoms are united by

Three bonds
Four bonds
Two bonds
One bond

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Cancer
Pneumoconiosis
Asthma
Silicosis

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Chemistry
The common refrigerant in domestic refrigerator is

Freon
Nitrogen
Neon
Oxygen

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Chemistry
Copper substances when exposed to air gains a green coating due to the formation of:

Cu(NO3)2
CuO
CuSO4
CuCO3 Cu(OH)2

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Chemistry
Laughing gas is

Nitrous oxide
Nitrogen pentoxide
Nitrogen trioxide
Nitric oxide

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

Argon
Bromine
Lead
Zinc

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