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Which of the following pairs of compound illustrate law of multiple proportions?

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Important Questions on Some Basic Concepts of Chemistry

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Gay Lussac's is not valid in the chemical reaction :
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Atomic weight of chlorine is 35.5. It has two isotopes of atomic weight 35 and 37. What is the percentage of the heavier isotope in the sample?
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The number of moles of nitrogen atom in  56 g nitrogen gas is
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The number of mole of N-atom in 18.066×1023 nitrogen atoms is
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What weight in grams is represents by 1.5 moles of sulphur dioxide?
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The number of atoms in 20 g of SO3 is approximately -
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The number of particles present in 1 mol of nitrogen atom are
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B has two isotopes B1019% and B1181%. The atomic mass of B is