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Methane
Butane
Ethane
Propane
The major constituent of air is
The major harmful gas emitted by automobile vehicle which causes air pollution is
The manufacture of iron from iron ore involves the process of
The mass number of a nucleus is
The mass number of an atom is equal to
The mass of one Avogadro number of helium atom is
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
The material known in commerce as Terylene is a
The material used in the manufacture of lead pencil is
The material which can be deformed permanently by heat and pressure is called a