Which of the following pairs can be cited as an example to illustrate the law of…
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Problem
Which of the following pairs can be cited as an example to illustrate the law of multiple proportion?
Na2O,K2OCaO,MgOAl2O3,Cr2O3CO,CO2
(1) Na2O,K2O
(2) CaO,MgO
(3) Al2O3,Cr2O3
(4) CO,CO2