JEE Main 2026 — Some Basic Concepts of Chemistry Question with Solution
JEE Main 2026 (22 January Shift 1)
Question
In the reaction,
Choose an option
Show full solutionCorrect option: A
Correct answer
A at STP is produced for every mole of HCl consumed.
Step-by-step explanation
Reaction:
Checking each option:
(1) Per 1 mole HCl: From stoichiometry, 6 mol HCl produces 3 mol H₂, so 1 mol HCl produces 0.5 mol H₂ = 11.2 L at STP. TRUE
(2) Per 1 mole Al: 2 mol Al produces 3 mol H₂, so 1 mol Al produces 1.5 mol H₂ = 33.6 L at STP only, not regardless of T and P. FALSE
(3) Volume ratio at same T,P: 6 mol HCl : 3 mol H₂ = 2:1, so 12 L HCl : 6 L H₂. TRUE
(4) Per 1 mole Al: 1.5 mol H₂ = 33.6 L, not 67.2 L. FALSE
Option (1) is correct.
Checking each option:
(1) Per 1 mole HCl: From stoichiometry, 6 mol HCl produces 3 mol H₂, so 1 mol HCl produces 0.5 mol H₂ = 11.2 L at STP. TRUE
(2) Per 1 mole Al: 2 mol Al produces 3 mol H₂, so 1 mol Al produces 1.5 mol H₂ = 33.6 L at STP only, not regardless of T and P. FALSE
(3) Volume ratio at same T,P: 6 mol HCl : 3 mol H₂ = 2:1, so 12 L HCl : 6 L H₂. TRUE
(4) Per 1 mole Al: 1.5 mol H₂ = 33.6 L, not 67.2 L. FALSE
Option (1) is correct.
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This is a previous-year question from JEE Main 2026, covering the Some Basic Concepts of Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.