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Question

The weights of two elements that combine with one another are in the ratio of their:


A

Equivalent weight

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B

Atomic weight

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C

Molecular weight

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D
  • All of these
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Solution

The correct option is B

Atomic weight


Explanation for correct option:

(B)Atomic weight

  • The law of multiple proportions states that the weight of one element is combined with a fixed weight of other elements during the formation of more than one compound in a ratio of small whole numbers.
  • This implies that the combination of two elements takes into account the ratio of their weights to their atomic weights.

Hence, option (B) is correct.

Explanation for incorrect option:

(A)Equivalent weight

  • The equivalent weight is obtained by dividing the atomic mass of an element by its valency
  • This remains constant for a particular element but during forming a compound the elements may be present in different proportions violating the law of multiple proportions

(C)Molecular weight

  • When elements combine, the weight of a particular element in more than one compound can only be present as a fractional ratio when they are related by their atomic weight as different elements can form molecules of various types like bimolecular, trimolecular, etc.
  • But, the atomic weight takes into consideration the elemental nature of that particular element only.

(D)All of these

  • This option can't be correct as options (A) and (C) are incorrect.

Hence, option (B) is correct.


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