JEE Main 2026 Chemistry question
A + 2 B AB2. 36.0 g of 'A' (Molar mass : 60 g mol⁻¹) and 56.0 g of 'B' (Molar mass : 80 g mol⁻¹) are allowed to react. Which of the following statements are correct? (A) 'A' is the limiting reagent (B) 77.0 g of AB2 is formed (C) Molar mass of AB2 is 140 g mol⁻¹ (D) 15.0 g of A is left unreacted after the completion of reaction. Choose the correct answer from the options given below:
Answer: (3)
Solution
Moles A=0.6, B=0.7. B is limiting reagent (0.35 mol used), 0.25 mol A remains (15g). AB2 formed = 0.35×220=77g. Molar mass AB2=220 g/mol.