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JEE Main levelSingle correct optionDifficulty 2 of 3ck194

For $A products$ the concentration of A at $t = 0, 20, 40, 60 s$ is $1.00, 0.72, 0.52, 0.37 M$ respectively. The average rate of disappearance of A between $20 s$ and $60 s$ , in $M s^{- 1}$ , is

A $0.0105$
B $0.0100$
C $0.0140$
D $0.00875$

Answer: D

Use only the end points of the stated interval:

- Δ c /Δ t = (0.72 - 0.37) / (60 - 20) = 0.35/40 = 0.00875 M s^{- 1}

. The other values are averages over

0

-

60

s,

20

-

40

s and

0

-

20

s.

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