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Chemistry

Chemistry
The percentage of carbon in cost iron is :

6 to 8
0.01 to 0.25
0.5 to 1.5
3 to 5

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Chemistry
Cement containing excess amount of lime

Becomes more strong
Cracks during setting
Is slow setting
Is quick setting

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Chemistry
For generation of biogas, the materials commonly used are

Crop residues
Forest residues
Aquatic plants
Animal wastes

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Chemistry
The natural resource, known as black gold is

Lead
Tin
Coal
Platinum

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Chemistry
The percentage of Nitrogen in Air is

85.02
0.03
0.94
78.03

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Chemistry
How many neutrons are there in 92U238 atom ?

146
92
238
330

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