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Chemistry

Chemistry
Sea weeds are important source of

Iron
Chlorine
Bromine
Iodine

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Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Deforstation
CFC emission
Methane emission
Carbondioxide emission

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Chemistry
Heating of a ore below its melting point in the absence of air is known as

Calcination
Roasting
Refining
Smelting

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Chemistry
Electric fuse is an alloy of

Carbon and tin
Copper and iron
Zinc and lead
Tin and lead

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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 ?

18
12
6
Zero

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Chemistry
Sour milk contains

Lactic acid
Citric acid
Tartaric acid
Acetic acid

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