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Chemistry

Chemistry
What is the covalency of nitrogen in ammonia molecule

3
2
4
5

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Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 10, 8
2, 6, 8, 4
2, 8, 8, 2
2, 8, 10

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Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Stratosphere
Ionosphere
Troposphere

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Chemistry
Conversion of chemical energy into electrical energy occurs in

Dynamo
A battery
Atomic bombs
Electric heaters

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Chemistry
Which one is the simplest form of alkane

Decane
Methane
Propane
Butane

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Chemistry
The hydronium ion is

H2+
H3O+
HO -
H+

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