Question

The graph given below shows the change in concentration of ${}^{\prime }{B}^{\prime }$ with time for the reaction $A\to B$. Identify the steps given below in sequence for determining instantaneous rate.
(a) Find the slope of the tangent $=\frac{y_2-y_1}{x_2-x_1}$
(b) Change in the $y$-axis that is $y_2-y_1$ gives change in concentration of 'B' whereas change in the $x$-axis that is $x_2-x_1$ gives a small change in time interval.
(c) Slope of the tangent is equal to instantaneous rate.
(d) Addition of same concentration of $HCl$ to the two test tubes.
(e) Taking equal masses of fine granules of zinc in two test tubes $A$ and $B$.

• A. $cabde$
• B. $eabcd$
• C. $edbac$
• D. $edcab$

Answer 1

Answer: (C)

$edbac$

The correct sequence of operations is:
(i)Taking equal masses of fine granules of zinc in two test tubes A and B.
(ii)The addition of same concentration of $HCl$ to the two test tubes.
(iii)Change in y-axis that is $y_2-y_1$ gives change in concentration of 'B' whereas a change in x-axis that is $x_2-x_1$ gives change in a time interval.
(iv) Find the slope of the tangent $\frac{y_2-y_1}{x_2-x_1}$
(v) The slope of the tangent is equal to instantaneous rate.