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Chemistry

Chemistry
CNG used in automobiles to check pollution, mainly consists of

CO2
N2
H2
CH4

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

Iron
Silicon
Oxygen
Magnesium

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Chemistry
The purest form of water is

Rain water
Tap water
Ground water
Distilled water

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Chemistry
The water pollution in river is measured by the dissolved amount of

Ozone
Oxygen
Chlorine
Nitrogen

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Chemistry
An electric iron has a heating element made of :

Nichrome
Copper
Zinc
Tungsten

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Chemistry
Brine refers to :

Pure water
Starch water
Sweet water
Salt water

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