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Question

The simplest formula of a compound containing 50% X(atomic mass 10 u) and 50% Y (Atomic mass 20 u) is :

A
XY2
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B
X2Y
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C
X2Y3
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D
XY
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Solution

The correct option is A X2Y
X2Y.
Total molecular mass of X2Y=2×X+1×Y
2×10+1×20=20+20=40
Total masses of X and Y in X2Y are 20 and 20.
Percentage of masses of X and Y in X2Y are 50% each.

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