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Chemistry

Chemistry
Maximum permissible concentration of total hardness in drinking water is

200
50
500
100

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Chemistry
Which of the following vitamins is generally excreted by human in urine?

Vitamin B
None of these
Vitamin C
Vitamin D

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Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Helium
Nitrogen
Oxygen
Hydrogen

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Chemistry
The depletion of Ozone layer is mainly due to

Radioactive rays
Volcanic eruptions
Aviation fuels
Chlorofluorocarbons

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Chemistry
Limestone is a raw material used by which industry?

Fertilizers
Petrochemicals
Cement
Aluminium

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Chemistry
Iron rusts quickly in

Distilled water
Sea water
Rain water
River water

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