Please solve 7th mcq

Q7. In a reaction 2HI  H2 + I2, the concentration of HI decrease from 0.5 ml L–1 to 0.4 mol L–1 in 10 minutes. What is the rate of reaction during this interval?

       (a) 5 × 10–3 M    min–1                             (b) 2.5 × 10–3 M min–1

       (c) 5 × 10–2 M min–1                                (d) 2.5 × 10–2 M min–1
 

Dear student,
 Q.7.       rate  =  -  1/2   ( HI /  t )  =  - 1/2 ( 0.4 - 0.5 ) / 10 = 0.5 × 10-2 = 5 × 10-3 M min-1 (option a)
Regards

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