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Chemistry

Chemistry
Highest percentage of carbon is found in which form of coal?

Peat
Anthracite
Lignite
Bituminous

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Chemistry
Which one of the following is a major green house gas?

Chloro fluorocarbon
Carbon monoxide
Carbon dioxide
Freon

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Chemistry
Black lung disease occurs in people working in

Organic solvents industry
Electroplating industry
Paint manufacturing industry
Coal mines

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

0.273
0.201
0.323
0.158

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Chemistry
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

0.5 gram of molecule
5 gram of molecule
10 gram of molecule
1 gram of molecule

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Chemistry
The main buffer system of the human blood is

NH2CONH2 - NH2CONH+
CH3COOH - CH3COO-
H2CO3 - CO32-
H2CO3 - HCO3

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