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I think the answer is option B)) H2O and D2O
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According to the law of multiple proportions..the masses combine in a simple whole number ratio and CO and CO2 does so...CO had 12 parts of carbon by mass and 16 parts of oxygen whereas CO2 has 12 parts of carbon and 32 part of oxygen by mass...so it is 16:32 which is 1:2...n it is option (a)
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