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Chemistry

Chemistry
Which one of the following minerals is found in pure form?

Iron
Manganese
Copper
Bauxite

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Chemistry
Among the fuels given below, the one with highest calorific value is

Wood
Natural gas
Coke
Coal

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Chemistry
The process which does not evolve CO2 in air is

Breathing
Organic delay
Burning
Photosynthesis

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Chemistry
Lead in water can cause

Eye disease
Hair falling
Kidney damage
Arthritis

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Chemistry
If water smells bad, then that odour can be removed by adding

Activated carbon
Deactivated nitrogen
Bleach
Alum

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Chemistry
The percentage of carbon in cost iron is :

0.5 to 1.5
0.01 to 0.25
6 to 8
3 to 5

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