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प्रश्न
25% of first order reaction is completed in 30 minutes. Calculate the time taken in minutes for the reaction to go to 90% completion.
उत्तर
t = 30 min
[A]0 = 100
[A]1 = 75
∴ `k = (2.303)/tlog [A]_0/[A]_1`
`therefore k = 2.303/30 log 100/75`
`therefore k = 0.076xx0.1249=9.58 xx 10^-3`
Now, time requried for 90% completion
t = ?
`[A]_0= 100`
`[A]_1 = 10`
k = 9.58 × 10-1
`9.58 × 10^-3 =2.303/t log 100/10 `
`t = 204.39 min`
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संबंधित प्रश्न
Select the correct alternative from the choices given :
A catalyst is a substance which:
Match the following:
(i) Diazotisation (a) Anisotropic
(ii) Crystalline solid (b) Reimer-Tiemann reaction
(iii) Phenol (c) Diphenyl
For a reaction , A + B → C+D the initial rate for different reactions and initial concentrations of reactants are given below:
| S.NO. | Initial Conc. | Initial rate (mole L–1 sec–1) | |
| [ A] mole L–1 | [B] mole L–1 | ||
| 1 | 1.0 | 1.0 | `2xx10^-3` |
| 2 | 2.0 | 1.0 | `4xx10^-3` |
| 3 | 4.0 | 1.0 | `8xx10^-3` |
| 4 | 1.0 | 2.0 | `2xx10^-3` |
| 5 | 1.0 | 4.0 | `2xx10^-3` |
(i) What is the overall order of reaction?
(ii) Write the rate law equation.
