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Chemistry - Chemical Kinetics Question with Solution | TestHub

ChemistryChemical KineticsSecond & nth Order ReactionsMedium2 minPYQ_2017

ChemistryMediumsingle choice

The half life of the first order reaction $CH_{3} . CHO (g) ⟶ CH_{4} (g) + CO (g)$ If initial pressure of $CH_{3} CHO$ (g) is $80 mm Hg$ and the total pressure at the end of 20 minutes is $120 mm Hg$

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Answer:

Solution:

$∴ p^{0} - p + p + p = 120 mm Hg or, p^{0} + p = 120 mm Hg; p = 120 - 80 = 40 mm Hg k = \frac{1}{t} ln \frac{p ^{0}}{p ^{0} - p} = \frac{1}{20} ln \frac{80}{80 - 40} = \frac{1}{20} ln 2$ Again, $t_{1/2} = \frac{ℓ n 2}{k}$ $∴ t_{1/2} = \frac{l n 2}{l n 2} \times 20 = 20 min$

Stream:VITEEESubject:ChemistryTopic:Chemical KineticsSubtopic:Second & nth Order Reactions

⏱ 2mℹ️ Source: PYQ_2017

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