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Chemistry

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

12
Zero
18
6

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Chemistry
Main pollutants released from iron and steel industry are

CO2, H2S and NO2
CO2, NO2 and SO3
NO, SO3 and H2S
CO, CO2 and SO2

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Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

2
0.01
1
0.05

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Chemistry
Sour taste of lemon is due to the presence of which of the following ?

Formic acid
Acetic acid
Oxalic acid
Citric acid

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Chemistry
The inherited traits of an organism are controlled by

enzymes
nucleotides
RNA molecules
DNA molecules

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Chemistry
Bauxite is used as raw material by which industry ?

Iron
Steel
Aluminium
Gold

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