JEE Main 2026 — Some Basic Concepts of Chemistry Question with Solution
JEE Main 2026 (22 January Shift 2)
Question
36.0 g of 'A' (Molar mass: ) and 56.0 g of ' (Molar mass: ) are allowed to react. Which of the following statements are correct ?
A. 'A' is the limiting reagent.
B. of is formed.
C. Molar mass of is .
D. of A is left unreacted after the completion of reaction.
Choose the correct answer from the options given below :
Choose an option
Show full solutionCorrect option: D
Correct answer
DB and D Only
Step-by-step explanation
Reaction: A + 2B → AB₂.
Moles of A = 36.0/60 = 0.6 mol;
Moles of B = 56.0/80 = 0.7 mol.
A requires 1.2 mol of B but only 0.7 available, so B is limiting reagent.
So, (A) False - B is limiting.
(B) AB₂ formed = 0.7/2 = 0.35 mol;
Molar mass AB₂ = 60 + 2(80) = 220 g/mol;
Mass = 0.35 × 220 = 77 g True.
(C) False - Molar mass is 220 g/mol.
(D) A remaining = 0.6 - 0.35 = 0.25 mol = 15 g True.
Correct statements: B and D.
Moles of A = 36.0/60 = 0.6 mol;
Moles of B = 56.0/80 = 0.7 mol.
A requires 1.2 mol of B but only 0.7 available, so B is limiting reagent.
So, (A) False - B is limiting.
(B) AB₂ formed = 0.7/2 = 0.35 mol;
Molar mass AB₂ = 60 + 2(80) = 220 g/mol;
Mass = 0.35 × 220 = 77 g True.
(C) False - Molar mass is 220 g/mol.
(D) A remaining = 0.6 - 0.35 = 0.25 mol = 15 g True.
Correct statements: B and D.
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