Question

Consider the graph given 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 determined graphically 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.