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Q.

For the reaction large 2HI, to ,{H_2} + {I_2}; the expression large - frac{1}{2}frac{{dleft[ {HI} right]}}{{dt}} represents

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a

 The rate of formation of HI

b

The rate of disappearance of HI

c

The instantaneous rate of the reaction

d

The average rate of reaction

answer is C.

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Detailed Solution

Question Image
Average,,rate = frac{{{c_2} - {c_1}}}{{{t_1} - {t_2}}} = frac{{Delta c}}{{Delta t}}

Concentration change in finite time intervals  gives average rate when 'Δ' must be used. When time → zero, 'Δ' must be replaced by 'd'.

instantaneous rate is measured at a particular instant 

instantaneous rate

= - frac{{dc}}{{dt}}
Question Image

Rate at a point 'X' represent instantaneous rate.

Thus for the reaction

2HI to {H_2} + {I_2}
Average,,rate = - frac{1}{2}frac{{Delta left[ {HI} right]}}{{Delta t}}

 

 

 

 

Instantaneous rate (at certain time)

= - frac{1}{2}frac{{dleft[ {HI} right]}}{{dt}}
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