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Chemistry

Chemistry
Laughing gas is

Nitrogen pentoxide
Nitrous oxide
Nitric oxide
Nitrogen trioxide

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Chemistry
The material known in commerce as Terylene is a

Natural fibre
Synthetic fibre
Blend of cotton and silk
Modified natural fibre

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Chemistry
Which among the following is found in chlorophyll ?

Fe2+
Ca2+
A l3+
Mg2+

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Chemistry
The common refrigerant in domestic refrigerator is

Nitrogen
Freon
Oxygen
Neon

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Chemistry
Normal rainwater is slightly acidic due to the presence of

Sulphur dioxide
Carbon dioxide
None of these
Methane

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Chemistry
Which one of the following metals pollutes the air of a city having large number of automobiles?

Copper
Chromium
Lead
Cadmium

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