A graph of volume of hydrogen released vs time for the reaction between zinc and dil. HCl is given in the figure. On the basis of this mark the correct option.

(a) Average rate upto 40 s is $\frac{V_{3} - V_{2}}{40}$
(b) Average rate upto 40 s is $\frac{V_{3} - V_{2}}{40 - 30}$
(c) Average rate upto 40 s is $\frac{V_{3}}{40}$
(d) Average rate upto 40 s is $\frac{V_{3} - V_{1}}{40 - 20}$

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Solution

Answer: (c) Average rate upto 40 s is $\frac{V_{3}}{40}$

$Z n + D i l . H C l \to Z n C l_{2} + H_{2} ↑$

Average rate of reaction = $\frac{C h a n g e i n c o n c e n t r a t i o n o f H_{2}}{C h a n g e i n t i m e} = \frac{V_{3} - 0}{40 - 0} = \frac{V_{3}}{40}$

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