Which one of the following statements about the law of chemical combin

Which one of the following statements about the law of chemical combination is not correct?

[amp_mcq option1=”Equal volumes of all gases at the same temperature and pressure contain equal number of molecules.” option2=”If two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of other element, are not in any proportion.” option3=”Matter can neither be created nor destroyed.” option4=”A given compound always contains exactly the same proportion of elements by weight.” correct=”option2″]