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Q.

Which of the following pairs of substances illustrate the law of multiple proportions

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a

H2O and D2O

b

 NaCl and NaBr

c

MgO and Mg(OH)2

d

CO and CO2

answer is B.

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Detailed Solution

  • Law of multiple proportions states that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.
  • In CO, 12 g of carbon combines with 16 g of oxygen
  • In CO2, 12 of carbon combine with 32 g of oxygen
  • So, the ratio of oxygen combined with carbon that we get is 1 : 2
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