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The neutral atom’s two isotopes differ in the number of
1 Electron shells
2 Protons
3 Valence electrons
4 Neutrons
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Potassium nitrate is used in 1 Salt 2 Glass 3 Fertilizer 4 Medicine
The inert gas which is substituted for nitrogen in the air, used by deep sea divers for breathing, is 1 Helium 2 Argon 3 Krypton 4 Xenon
The final products of combustion of ethane are 1 Carbon and oxygen 2 Ethylene and Hydrogen 3 Water and Carbon monoxide 4 Carbon dioxide and water
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The disease that is caused by viral infection is
methane is not present in
Water is a compound because 1 It exists as a solid, a liquid or a gas 2 It contains hydrogen and oxygen 3 It contains two different elements joined by chemical bonds 4 It cannot be split up into simpler substances by chemical means
Biological Sciences 
