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Which of the following pairs of compound illustrate law of multiple proportions?
(a)
(b)
(c)Ethane, benzene
(d)

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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 . It has two isotopes of atomic weight and . What is the percentage of the heavier isotope in the sample?

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The number of moles of nitrogen atom in nitrogen gas is

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The number of mole of -atom in nitrogen atoms is

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What weight in grams is represents by of sulphur dioxide?

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The number of atoms in of is approximately -

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The number of particles present in of nitrogen atom are

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has two isotopes and . The atomic mass of is
