Which of the following statements illustrate the law of multiple proportions?

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3.47 g of ${BaCl}_{2}$ reacts with 2.36 g ${Na}_{2} {SO}_{4}$ + to give 3.88 g ${BaSO}_{4}$ and 1.95 g NaCl

Hydrogen sulphide contains 5.89% hydrogen, water contains 1 I .l% hydrogen and sulphur dioxide contains 50% oxygen

An element forms two oxides, XO and ${XO}_{2}$ containing 50% and 60% oxygen respectively. The ratio of masses of oxygen which combines with 1 g of element is 2 : 3

20 mL ammonia gives l0 volumes $N_{2}$ and 30 volumes $H_{2}$ at constant temperature and pressure

answer is C.

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Detailed Solution

In XO, 50 g of element combines with 50 g of oxygen.
$∴$ I g of element combines with I g of oxygen.
In ${XO}_{2}$ , 40 g element combines with 60 g of oxygen.
Thus, ratio of masses of oxygen which combines with 1 g of element is I : 1.5 or 2 : 3. This is in accordance with the law of multipte proportions. In (b) the law of reciprocal proportions is followed.
In (a) law of conservation of mass is followed while in (d) Avogadro's law is followed

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