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Which of the following hypotheses of Da...

Which of the following hypotheses of Dalton's atomic theorey explains the law of constant composition?
(i) All mater is composed of atoms.
(ii) Atoms cannot be created, divided or destroyed.
(iii) All the atoms of one element are alike, and different from these of any other element.
(iv) Atoms combine together in the ratio of small whole numbers.

A

(i),(ii),(iii),(iv)

B

(ii),(iii),(iv)

C

(i),(iii),(iv)

D

(i),(ii),(iii)

Text Solution

Verified by Experts

The correct Answer is:
C
A pure sample of water from any source always consists of water molecules only. A water molecule always consists of `H` and `O` atoms combined in the ratio of `2:1`. Every `H` atom has fixed mass of `1 u` and every `O` has fixed mass of `16u`. Therefore ratio, by mass is always `2:16` or `1:8`.
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