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Carbon dioxide only
A mixture of carbon dioxide and nitrogen
A mixture which has more carbon dioxide than oxygen
A mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
The existence of different isotopes of an element is due to the presence of a different number of _ in the nucleus of their atoms
The fibre least prone to catch fire is
The first metal used by man was
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
The formula C6H14 represents the hydrocarbon _.
The formula C6H5-CO-CH3 represents
The formula of lithium nitride is
The fundamental particles present in equal numbers in neutral atoms are
The fundamental particles present in the nucleus of an atom are
The gas causing acid rain in an industrial area is