Q1 of 22 Page 113

In water, hydrogen and oxygen are combined in the ratio of ____by mass.

a) 1:8 b) 8:1 c) 2:3

(a) 1:8

Because this follows the law of definite proportion. According to which the elements of the compound are proportionate by mass. Mass of hydrogen is 1 and that of oxygen is 8, which makes the ratio 1:8, the right answer.


More from this chapter

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1

The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of______

a) Reciprocal proportion b) definite proportion c) multiple proportions

 1

Which one of the following is a wrong statement, regarding the postulates of Dalton’s Atomic Theory?

a) The matter is made up of small indivisible particles called atoms.


b) Atoms of the same element are different in all respects.


c) Atoms of different elements are different in all respects.

 1

Dalton’s Atomic Theory successfully explained the Law of ______.

i) Conservation of Mass


ii) Definite Proportions


iii) Radioactivity


iv) Multiple Proportions


a) (i), (ii) and (iii) b) (i), (iii) and (iv) c) (i) ,(ii) and (iv)

 1

Based on the Thomson’s model of an atom, say which of the following statements are correct.

i) The positive charge is assumed to be uniformly distributed over the atom.


ii) The electrons are uniformly distributed in the positively charged sphere.


iii) The electrons attract each other to stabilize the atom.


iv) The mass of the atom is assumed to be uniformly distributed over the atom.


a) (i) ,(ii) and (iv) b) (i),(ii) and (iii) c) (i) and (iii)