MCQ
Percentage Composition
By Sakshi Goel | 19 May'20 | 995 Views
MCQ
Problem:
Solution:
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The simplest formula of a compound containing 50 % of element X (atomic weight = 10) and 50 % of element Y (atomic weight = 20) is
(a) XY
(b) X2Y
(c) XY2
(d) X2Y3
Solution:
To have both as 50 %, the total mass of both X and Y should be equal. We will consider the options here:
In XY, total mass of X = 10 g, total mass of Y = 20 g. So, this option is incorrect.
In X2Y, total mass of X = 2 x 10 = 20 g, total mass of Y = 20 g. So, both X and Y are 50 % each. This option is correct.
In XY2, total mass of X = 10 g, total mass of Y = 2 x 20 = 40 g. So, this option is incorrect.
In X2Y3, total mass of X = 2 x 10 = 20 g, total mass of Y = 3 x 20 = 60 g. So, this option is incorrect.
Option (b) is correct.
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