A reaction follows the given concentration (M) -time graph. The rate for this reaction at $20$ seconds will be:

4 \times 10^{- 3} M s^{- 1}

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2 \times 10^{- 2} M s^{- 1}

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5 \times 10^{- 1} M s^{- 1}

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7 \times 10^{- 3} M s^{- 1}

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Solution

The correct option is C $5 \times 10^{- 1} M s^{- 1}$
Rate of formation = $\frac{c h a n g e i n c o n c e n t r a t i o n}{c h a n g e i n t i m e}$
= $\frac{15 - 5}{20 - 0}$

= $\frac{10}{20}$

$0.5 M s^{- 1}$
option C is correct i.e. $5 \times 10^{- 1} M s^{- 1}$

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