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Chemistry

Chemistry
Dry ice is the solid form of :

Water
Carbon di–oxide
Nitrogen
Air

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Chemistry
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?

12
Zero
6
18

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Chemistry
Which one of the following is not a ‘green house gas’ ?

Carbon dioxide
Chlorofluorocarbons
Nitrogen
Methane

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Chemistry
Which of the following in automobile exhaust can cause cancer?

Lead
Polyclinic hydrocarbons
Oxides of nitrogen
Carbon monoxide

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Chemistry
A non-electronic conductor is

Gas Carbon
None of these
Copper Sulphate
Iron

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Chemistry
Commercial nitric acid is coloured because it contains dissolved :

Oxygen
Nitrogen dioxide
Coloured impurities
Nitrous oxide

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