• # question_answer A graph of volume of hydrogen released vs time for the reaction between zinc and dil. HCl is given in figure. On the basis of this mark the correct option. A) Average rate upto 40s is $\frac{{{V}_{3}}-{{V}_{2}}}{40}$ B) Average rate upto 40 seconds is $\frac{{{V}_{3}}-{{V}_{2}}}{40-30}$ C) Average rate upto 40 seconds is $\frac{{{V}_{3}}}{40}$ D) Average rate upto 40 seconds is $\frac{{{V}_{3}}-{{V}_{1}}}{40-20}$

Average rate $=\frac{\Delta R}{\Delta t}=\frac{{{V}_{3}}}{40}$