JEE Main 202622 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 22 January
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Some Basic Concepts of Chemistry
JEE Main 2026 · 22 January · Evening Shift · Chemistry · Some Basic Concepts of Chemistry
A+2 ~B AB_ 2 36.0 g of 'A' (Molar mass: 60 ~g ~mol^ -1 ) and 56.0 g...
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 :
Options
- AC and D Only
- BA and B Only
- CA and C Only
- DB and D Only
Correct answer
D. B and D Only
Step-by-step solution
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.