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STD 11 - 1. Some basic concept of chemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 1. Some basic concept of chemistry4 Marks
MCQ
The following data are obtained when dinitrogen and dioxygen react together to form different compounds

Mass of dinitrogen Mass of dioxygen
$14\, g$ $16\, g$
$14\, g$ $32\, g$
$28\, g$ $32\, g$
$28\, g$ $80\, g$

Which law of chemical combination is obeyed by the above experimental data ?

  • A
    Law of conservation of mass
  • B
    Law of definite proportions
  • ✓
    Law of multiple proportions
  • D
    Avogadro's Law
✓

Answer

Correct option: C.
Law of multiple proportions
c
Fixing the mass of dinitrogen as $14\,g,$ the mass of dioxygen combined varies as $16,32 .$ The reactants are in the ration $1: 1$ and $1: 2,$ respectively and forms different compounds.

Similarly other ratio of the reactants are $2: 1,2: 5$ in case of fixing mass of $N_{2}$ as $28 \mathrm{g}$ and varing mass of $O_{2}$ as $32 \mathrm{g}$ and $80 \mathrm{g}$ respectively.

Here two elements combine to form more than one compound and the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers. Thus they follow the law of multiple proportions. thus option $C$ is correct.

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