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Chemistry

Chemistry
What is the atomic number of mercury

32
80
63
41

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Chemistry
Besides CO2, the other green house gas is

O2
N2 N2
CH4
Ar Ar

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Chemistry
Hydrogen is not found in atmosphere because

It is absorbed by plants
It is the lightest gas
It is highly inflammable
It immediately combines with oxygen to form water

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Chemistry
In a period from Li to F, ionisation potential

Decreases
Cannot be predicted
Remains same
Increases

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Chemistry
White phosphorus is always kept under

Benzene
Kerosene
Ether
Water

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Chemistry
Among the following, which is always found in free-state in nature?

Silver
Gold
Copper
Sodium

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