AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) 2Al + 3Cl₂ → 2AlCl₃
LHS: 2 Al, 6 Cl atoms. RHS: 2 Al, 6 Cl atoms — both sides are equal, so the equation is balanced.
To balance Al + Cl₂ → AlCl₃, apply the hit-and-trial method. AlCl₃ needs 3 Cl atoms, but Cl₂ provides 2 — so use 3 Cl₂ (6 Cl atoms) and 2 AlCl₃ (6 Cl atoms), then balance Al with coefficient 2. Options C and D use incorrect formulae/products, violating the rule that formulae cannot be altered during balancing.