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Chemistry

Chemistry
The maximum number of covalent formed by nitrogen is

4
1
3
2

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Chemistry
Among the following, carbonate ore of Zinc is

Zincite
Zincblende
Sphalerite
Calamine

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Chemistry
Catalytic converters are generally made from :

Carbon
Alkaline metals
Hydrogen
Transition metals

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Chemistry
Periodic table contains how many periods

6
7
8
10

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Chemistry
Percentage of lead in lead pencils is

40
80
31-66

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Chemistry
For generation of biogas, the materials commonly used are

Crop residues
Aquatic plants
Forest residues
Animal wastes

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