assertion: in a pure substance,same elements are always present in a definite proportion by mass. reason the elements present in magnesium oxide are and oxygen only,the ratio of mass of magnesium to the mass of oxygen is 3:2
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assertion: in a pure substance,same elements are always present in a definite proportion by mass. reason the elements present in magnesium oxide are and oxygen only,the ratio of mass of magnesium to the mass of oxygen is 3:2
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