Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weighs 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y are _______ . (A) 30, 20 (B) 40, 30 (C) 60, 40 (D) 20, 30

Suppose the elements X and Y combine to form two compounds XY₂ and X

1.	Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weighs 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y are _______ . (A) 30, 20 (B) 40, 30 (C) 60, 40 (D) 20, 30
Answer» (B) 40, 30Explanation:As per the question,Let us consider that atomic weight of element X = xAnd the atomic weight of element Y = yAccording to given data of question,When 0.1 mole of XY₂ weighs 10 g, that is,And when 0.05 mole of X₃Y₂ weighs 9 g, that is,Now we have two EQUATIONS and two VARIABLES, on solving we get2x = 80⇒ x = 40And,∴ y = 30Hence, the atomic weights of X and Y are 40 and 30 respectively.Hence, the CORRECT OPTION is (B).