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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)
How many neutrons does iron have?
Hydrogen and chlorine react vigorously in the presence of light (explosively) due to the formation of