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Chemistry

Chemistry
Which among the following elements is found in maximum percentage in the human body ?

Oxyzen
Carbon
Nitrozen
Hydrogen

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Chemistry
The new strain of bacteria produced by biotechnology in alcohol industry is

Escherichia coli
Saccharomyces cerevisiae
Pseudomonas putida
Bacillus subtilis

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Chemistry
Hydrogen is not found in atmosphere because

It is the lightest gas
It is highly inflammable
It immediately combines with oxygen to form water
It is absorbed by plants

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Chemistry
The chemical substance present in bones and teeth is

Calcium sulphate
Calcium borate
Calcium phosphate
Calcium chloride

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Chemistry
Which one of the following is extensively used for sterilizing water ?

Bleaching powder
Alum
Soda powder
Borax powder

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.658
0.509
0.305
0.727

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