Pick out correct statement for H2 SO4. (1) Zn reduces concentrated H2 SO4 to form SO2 and H2 S

Name: Problem 125, Chapter 7: Objective Chemistry for NEET Vol II
Uploaded: 2022-02-11T10:21:09-08:00
Duration: 24 s
Channel: Mishal Gul
Description: Pick out correct statement for H2 SO4. (1) Zn reduces concentrated H2 SO4 to form SO2 and H2 S . (2) Cu is oxidized by concentrated H2 SO4 to form only H2 S. (3) Carbon or sulphur are oxidized by concentrated H2 SO4 to the respective dioxides (4) But-1-ene when hydrated in presence of concentrated H2 SO4 form butan- 2 -ol (a) 1,3,4 (b) 2,3,4 (c) 1,3 , (d) 1,2,3,4

step 1 Pick out the correct statement for sulfuric acid. After these 4 statements, the correct answer i

Question

Pick out correct statement for $\mathrm{H}_{2} \mathrm{SO}_{4}$. (1) $\mathrm{Zn}$ reduces concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{~S} .$ (2) $\mathrm{Cu}$ is oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form only $\mathrm{H}_{2} \mathrm{~S}$. (3) Carbon or sulphur are oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to the respective dioxides (4) But-1-ene when hydrated in presence of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ form butan- 2 -ol (a) $1,3,4$ (b) $2,3,4$ (c) 1,3 , (d) $1,2,3,4$

   Pick out correct statement for $\mathrm{H}_{2} \mathrm{SO}_{4}$.
(1) $\mathrm{Zn}$ reduces concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{~S} .$
(2) $\mathrm{Cu}$ is oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form only $\mathrm{H}_{2} \mathrm{~S}$.
(3) Carbon or sulphur are oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to the respective dioxides
(4) But-1-ene when hydrated in presence of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ form butan- 2 -ol
(a) $1,3,4$ (b) $2,3,4$
(c) 1,3 , (d) $1,2,3,4$

Objective Chemistry for NEET Vol II

Pearson Education 2nd Edition

Chapter 7, Problem 125

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Solved by Expert Mishal Gul

02/11/2022

Step 1

Statement 1: $\mathrm{Zn}$ reduces concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{~S} .$ This statement is correct. When zinc reacts with concentrated sulfuric acid, it reduces the sulfuric acid to form sulfur Show more…

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Pick out correct statement for $\mathrm{H}_{2} \mathrm{SO}_{4}$. (1) $\mathrm{Zn}$ reduces concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{~S} .$ (2) $\mathrm{Cu}$ is oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form only $\mathrm{H}_{2} \mathrm{~S}$. (3) Carbon or sulphur are oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to the respective dioxides (4) But-1-ene when hydrated in presence of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ form butan- 2 -ol (a) $1,3,4$ (b) $2,3,4$ (c) 1,3 , (d) $1,2,3,4$

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Key Concepts

Oxidizing Nature of Concentrated Sulfuric Acid

Concentrated H2SO4 is a strong acid that also acts as a powerful oxidizing agent. In redox reactions, it oxidizes metals and certain non?metals by accepting electrons and reducing its sulfate ion to species such as sulfur dioxide (SO2). This dual role means that reactions with concentrated H2SO4 differ from those with dilute acid, often leading to oxidation products rather than just protonation or hydrogen evolution.

Acid-Catalyzed Hydration of Alkenes (Markovnikov Addition)

When alkenes are treated with strong acids like concentrated H2SO4 in the presence of water, the reaction proceeds via acid-catalyzed hydration. In this process, the alkene undergoes electrophilic addition where the hydrogen adds to the less substituted carbon, leading, by Markovnikov’s rule, to the formation of a more stable carbocation intermediate. The subsequent attack by water produces the more substituted alcohol.

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