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Chemistry

Chemistry
The percentage of nitrogen present in ammonium sulphate is :

0.25
0.18
0.305
0.27

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Chemistry
For generation of biogas, the materials commonly used are

Aquatic plants
Forest residues
Crop residues
Animal wastes

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

O2
H2
He
N 2

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Chemistry
Nitric acid does not react with

Gold
Copper
Iron
Zinc

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Chemistry
Hard steel contains

2 to 5 per cent carbon
0.5 to 1.5 per cent carbon
0.01 to 0.04 per cent carbon
0.1 to 0.4 per cent carbon

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Chemistry
Helium is added to the oxygen supply of deep sea divers because it is

Less soluble in blood than nitrogen at high pressure
Readily miscible with oxygen
Lighter than nitrogen
Less poisonous than nitrogen

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