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Chemistry

Chemistry
Catalytic converters are generally made from :

Transition metals
Alkaline metals
Carbon
Hydrogen

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Chemistry
Greenhouse effect is caused by

Nitrogen dioxide
Nitrogen
Carbon monoxide
Carbon dioxide

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Chemistry
Helium gas is filled in ballons because

It is lighter than air
Its atomic number is 2
It is one of the constitutents of water
It is a noble gas

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Chemistry
Which one of the following has a maximum tendency to form M3 ion ?

Bi
N
As
P

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Chemistry
The third shell of an atom can have a maximum of ______ electrons

13
18
21
15

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Chemistry
Colour imparted to the Bunsen flame by strontium salt is

Brick red
Apple-green
Bluish green
Crimson red

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