Q. Suppose the elements X and Y combine to form two compounds $XY_2$ and $X_3Y_2$. When 0.1 mole of $XY_2$ weighs 10 g and 0.05 mole of $X_3Y_2$ weighs 9 g, the atomic weights of X and Y are

A) 40, 30
B) 60, 40
C) 20, 30
D) 30, 20
Explanation

[Solution] X + 2Y = 100 and 3X + 2Y = 180, giving X = 40 and Y = 30. Answer (1).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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