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Chemistry

Chemistry
The octane number of zero is assigned to

iso-octane
2-methyl octane
3-methyl octane
n-heptane

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Chemistry
The element absorbed both in cation and anion form is

Nitrogen
Phosphorus
Calcium
Sulphur

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Chemistry
Surface water is a better source of drinking water because it is poor in

Dust
Algae
Bacteria
Arsenic

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Chemistry
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?

6
18
12
Zero

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Chemistry
When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocating of pond that does not leave enough oxygen needed to support life. This type of pollution is called

Eutrophication
Green house effect
None of these
Smog

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Chemistry
Vinegar is ________ .

Glacial formic acid
Diluted acetic acid
Glacial acetic acid
Diluted formic acid

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