Question

Which of the following options does not show instantaneous rate of reaction at $40^{th}$ second?

• A. $\frac{V_{5}-V_{2}}{50-30}$
• B. $\frac{V_{4}-V_{2}}{50-30}$
• C. $\frac{V_{3}-V_{2}}{40-30}$
• D. $\frac{V_{3}-V_{1}}{40-20}$

Answer 1

Answer: (B)

$\frac{V_{4}-V_{2}}{50-30}$

Answer 2

Instantaneous rate can be determinedgraphically by drawing a tangent on the curve.Thus, volume change during $50-30$ sec. interval $=V_{5}-V_{2}$ and not $V_{4}-V_{2}$. Hence, $\frac{V_{4}-V_{2}}{50-30}$ does not show instantaneous rate of reaction at $40^{th}$ second.