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Chemistry

Chemistry
The pollutant responsible for ozone holes is ________

CFC
CO2
CO
SO2

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Chemistry
If we burn graphite,

It will change into diamond
Residue will be left
It will not burn
No residue will be left

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Chemistry
By which organic compound all the oils are known ?

Protein
Carbohydrate
Ester
Hydrocarbon

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Chemistry
The value of Avogadro Number is

6.023 × 1022
6.023 × 1025
6.023 × 1023
6.023 × 1024

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Chemistry
The metal used to recover copper from a solution of copper sulphate is

Fe
Na
Ag
Hg

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Chemistry
What happens when a chemical bond is formed ?

Energy is neither released nor absorbed
Energy is always absorbed
Energy in always released
More energy is released than is absorbed

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