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Chemistry

Chemistry
The percentage of oxygen in air is approximately

0.01
1
0.78
0.21

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Chemistry
The function of skimming tank in sewage treatment is to remove

Suspended solids
Gritty substances
Oil and fatty substances
Inorganic substances

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Chemistry
What is the chemical symbol of mercury

None of these
Mr
Hg
Mg

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Chemistry
Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid ?

Methyl orange
Phenolphthaline
Methylene blue
Methyl red

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Chemistry
The percentage of Nitrogen in Air is

0.94
78.03
85.02
0.03

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Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

O3
CO2
All of these
CO

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