Test Index

Redox Reactions

Section: Chemistry

Question : 61 of 73

Marks: +1, -0

The redox reaction among the following is :

[7 Jan 2020 Shift 2]

Combination of dinitrogen with dioxygen at 2000 K
Formation of ozone from atmosphereic oxygen in the presence of sunlight
Reaction of $\mathrm{H}_2\mathrm{SO}_4$ with NaOH
Reaction of $[\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]\mathrm{Cl}_3$ with $\mathrm{AgNO}_3$

Validate

Solution:

(i)

\mathrm{N}_2 + \mathrm{O}_2 \xrightarrow{200\,\text{K}} 2\mathrm{NO}

(Redox reaction)

during the reaction, oxidation of nitrogen take place from 0 to 2 and reduction of oxygen take place from 0 to -2. It means this reaction is redox reaction.

(ii)

3\mathrm{O}_2 \xrightarrow{h\upsilon} 2\mathrm{O}_3

(Non - redox reaction)

(iii)

\mathrm{H}_2\mathrm{SO}_4 + 2\mathrm{NaOH}

\rightarrow \mathrm{Na}_2\mathrm{SO}_4 + 2\mathrm{H}_2\mathrm{O}

(neutralization reaction)

(iv)

[\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]\mathrm{Cl}_3 + 3\mathrm{AgNO}_3

\rightarrow 3\mathrm{AgCl} \downarrow + [\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6](\mathrm{NO}_3)_3

(White ppt.)

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