Ncert Exercises & Solutions

A graph of volume of hydrogen released vs time for the reaction between zinc and dil. HCl is given in the graph below.

The correct statement among the following based on the graph given above is:

$1 . Average rate upto 40 s is \frac{V_{3} - V_{2}}{40} 2 . Average rate upto 40 s is \frac{V_{3} - V_{2}}{40 - 30} 3 . Average rate upto 40 s is \frac{V_{3}}{40} 4 . Average rate upto 40 s is \frac{V_{3} - V_{1}}{40 - 20}$

HINT: Rate of reaction = $\frac{Change in concentration}{Change in time}$

Explanation: In the question, instead of a change in concentration, a change in volume is given. A change in volume can also explain the change in concentration.

The reaction is as follows:

$\begin{array}{l} Zn + Dil. HCl \to {ZnCl}_{2} + H_{2} ↑ \\ Average rate of reaction = \frac{Change in volume H_{2}}{Change in time} = \frac{V_{3} - 0}{40 - 0} = \frac{V_{3}}{40} \end{array}$

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