JEE Main 2026 — Some Basic Concepts of Chemistry Question with Solution
JEE Main 2026 (28 January Shift 2)
Question
For the given reaction:
If is added to 300 mL of HCl which contains by mass and has density , then which of the following option is correct ?
Given molar mass of and O are 1, 35.5, 40 and respectively.
If is added to 300 mL of HCl which contains by mass and has density , then which of the following option is correct ?
Given molar mass of and O are 1, 35.5, 40 and respectively.
Choose an option
Show full solutionCorrect option: A
Correct answer
A64.97 g of HCl remains unreacted
Step-by-step explanation
Molar masses: HCl = 36.5, CaCO₃ = 100 g/mol
HCl solution: mass = 300 × 1.13 = 339 g
HCl present: 339 × 0.3855 = 130.74 g = 130.74/36.5 = 3.58 mol
CaCO₃: 90/100 = 0.9 mol
Reaction:
HCl required: 0.9 × 2 = 1.8 mol
HCl available: 3.58 mol > 1.8 mol
CaCO₃ is limiting. HCl remaining: (3.58 - 1.8) × 36.5 = 1.78 × 36.5 = 64.97 g
HCl solution: mass = 300 × 1.13 = 339 g
HCl present: 339 × 0.3855 = 130.74 g = 130.74/36.5 = 3.58 mol
CaCO₃: 90/100 = 0.9 mol
Reaction:
HCl required: 0.9 × 2 = 1.8 mol
HCl available: 3.58 mol > 1.8 mol
CaCO₃ is limiting. HCl remaining: (3.58 - 1.8) × 36.5 = 1.78 × 36.5 = 64.97 g
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