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Lighter than hydrogen
More abundant than hydrogen
Non-combustible
More stable
Helium is added to the oxygen supply of deep sea divers as it is
Higher concentration of nitrogen dioxide in atmosphere air causes
Highest percentage of carbon is found in which form of coal?
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is
How many carbon and hydrogen atoms are there in Propane, respectively?
How many electrons are there in a Hydrogen atom?
How many electrons are there in Na+
How many groups and periods are present in the Modern Periodic Table?
How many molecules are present in one mole of water?
How many moles are there in 140g of Si (atomic mass of silicon is 28)