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Chemistry · PYQ NEET UG 2016(2)
हिन्दीSuppose the elements X and Y combine to form two compounds \( \text{XY}_2 \) and \( \text{X}_3\text{Y}_2 \). When \( 0.1\text{ mole} \) of \( \text{XY}_2 \) weighs \( 10\text{ g} \) and \( 0.05\text{ mole} \) of \( \text{X}_3\text{Y}_2 \) weighs \( 9\text{ g} \), the atomic weights of X and Y are
Correct answer · Option 2
40, 30
Explanation
Let atomic weights be \( x \) and \( y \). Molar mass of \( \text{XY}_2 = 100 \implies x + 2y = 100 \). Molar mass of \( \text{X}_3\text{Y}_2 = 180 \implies 3x + 2y = 180 \). Solving gives \( x = 40, y = 30 \).
