Higher temperature speeds up decomposition rate

Steps:

• Reaction rate increases with temperature per Arrhenius equation.
• Faster rate causes volume of P to drop quicker and Q to rise quicker over time.
• Graph with steeper volume change (P decreasing faster, Q increasing faster) shows higher temperature.
• Match graphs: slower curve (graph 2) to lower T, faster curve (graph 3) to higher T.

Why A is correct:

• Assigns graph 2 (slower) to T1 and graph 3 (faster) to T2, with T1 > T2 matching steeper curve to higher T.

Why the others are wrong:

• B: Reverses T relation; slower graph can't be higher T.
• C: Swaps graphs; assigns faster curve to lower T.
• D: Swaps graphs and reverses T; contradicts rate-temperature link.

Final answer: A