For a reaction
$2A_2+ B_2→ 2A_2B$
The reactant A will be consumed at:

double the rate at which B is consumed.

The correct answer is Option (3) → double the rate at which B is consumed.

For the reaction:

$2A_2 + B_2 \to 2A_2B$

• Stoichiometry: 2 moles of $A_2$​ react with 1 mole of $B_2$​ to give 2 moles of $A_2B$B.
• Rate of consumption relationship:

$\text{Rate of consumption of } A_2 : \text{Rate of consumption of } B_2 = 2 : 1$

⇒ A₂ is consumed at double the rate of B₂.

✅ Correct answer: double the rate that B is consumed