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Chemistry

Chemistry
Formation of ozone hole is maximum over

Antarctica
Africa
India
Europe

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

Lead
Polyclinic hydrocarbons
Carbon monoxide
Oxides of nitrogen

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Chemistry
Permanent – hardness of water may be removed by addition of

Potassium Permangante
Lime
Alum
Sodium carbonate

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Chemistry
Philosopher’s wool is chemically

Magnesium oxide
Aluminium oxide
Zinc oxide
Calcium oxide

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Chemistry
The chemical name of 'laughing gas' is

Nitrous oxide
Nitric oxide
Nitrogen pentoxide
Nitrogen dioxide

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Hydrogen at cathode and oxygen at anode
Copper at cathode and anodes dissolve to give copper
Copper at cathode and oxygen at anode
Copper at anode and oxygen at cathode.

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