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A graph of volume of hydrogen released vs time for the reaction between zinc and dil. \( \mathrm{HCl} \) is given in Fig. On the basis of this mark the correct option.
- (i) Average rate upto \( 40 \mathrm{~s} \) is \( \frac{V_{3}-V_{2}}{40} \)
- (ii) Average rate upto 40 seconds is \( \frac{V_{3}-V_{2}}{40-30} \)
- (iii) Average rate upto 40 seconds is \( \frac{V_{3}}{40} \)
(iv) Average rate upto 40 seconds is \( \frac{V_{3}-V_{1}}{40-20} \)
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