Practice question

Given: What is the mass percentage of a solution formed by mixing 50 g of a 10% (w/w) solution with 100 g of a 25% (w/w) solution? Formula: Mass of solute from first = 0.1 × 50 = 5 g. Substitution & Calculation: Mass of solute from second = 0.25 × 100 = 25 g . Total solute = 5 + 25 = 30 g. Total mass = 50 + 100 = 150 g. Mass % = 30/150 × 100 = 20% . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.