Question
In the reaction, 2 Al ( s )+6 HCl ( aq ) 2 Al ^ 3+ ( aq )+6 Cl ^ - ( aq )+3 H _ 2 ( ~g )
JEE Main
Chemistry
Some Basic Concepts of Chemistry
2026
JEE Main 2026 (22 January Shift 1)
JEE Main Chemistry Question (2026) — Solution
Options
- A. 11.2 ~L H _ 2 ( ~g ) at STP is produced for every mole of HCl consumed.
- B. 33.6 ~L H _ 2 ( ~g ) is produced regardless of temperature and pressure for every mole of Al that reacts.
- C. 12 ~L HCl ( aq ) is consumed for every 6 ~L H _ 2 ( ~g ) produced.
- D. 67.2 ~L H _ 2 ( ~g ) at STP is produced for every mole of Al that reacts.
Answer
A. 11.2 ~L H _ 2 ( ~g ) at STP is produced for every mole of HCl consumed.
Step-by-step solution
Reaction: 2 Al (s) + 6 HCl (aq) 2 Al ^ 3+ (aq) + 6 Cl ^-(aq) + 3 H _2(g) 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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