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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Silicon
Iron
Oxygen
Magnesium

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Chemistry
Combustion of a candle is a/an

Endothermic reaction
Physical change
Exothermic reaction
Photochemical reaction

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Chemistry
Detergents used for cleaning clothes and utensils contain

Nitrates
Bicarbonates
Bismuthates
Sulphonates

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Chemistry
Which one of the following statement is correct ?Ozone is found in the earth's atmosphere mostly between

50 and 100 km
10 and 20 km
5 and 10 km
20 and 50 km

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Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

More efficient car engines
Static electricity to attract it in factory chimneys
Low - sulphur fuels
Catalytic converters in industry

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Chemistry
Ethanol containing 5% water is known as

Denatured spirit
Rectified spirit
Power alcohol
Methylated alcohol

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MORE MCQ ON Chemistry

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