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Chemistry

Chemistry
What are the number of moles of CO2 which contains 16 g of oxygen?

0.4 mole
0.2 mole
0.25 mole
0.5 mole

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Aquatic macrophytes
Auatic fungi
Evapotranspiration
Effluents

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Chemistry
The maximum number of covalent formed by nitrogen is

3
1
2
4

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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
Methylene blue
Methyl red
Phenolphthaline

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Chemistry
The most common cause of pollution of air is

Smoke
Carbon dioxide
Carbon monoxide
Sulphur dioxide

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Chemistry
An element of atomic no. 29 belongs to

F-block
D-block
P-block
S-block

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MORE MCQ ON Chemistry

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