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Chemistry

Chemistry
The most electronegative element among the following is

bromine
fluorine
sodium
oxygen

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Chemistry
The metal present in vitamin B12 is

Mg
Co
Fe
Mo

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Chemistry
The basic chemical building block of natural rubber obtained from trees is

Acetylene
Vinyl Chloride
Neoprene
Isoprene

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Chemistry
The percentage of oxygen in air is approximately

0.01
0.78
1
0.21

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Chemistry
Which one of the following is used as a sowing agent in the preparation of soft drinks?

Boric acid
Salicylic acid
Phosphoric acid
Phosphorus acid

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Chemistry
Which of the following is biodegradable ?

Plastic
Paper
D.T.
Aluminium

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