The process that is NOT endothermic in nature is:

Option 1 -

$H_{(g)} + e^{-} \to H_{(g)}^{-}$

Option 2 -

$O_{(g)}^{-} + e^{-} \to O_{(g)}^{2 -}$

Option 3 -

${N a}_{(g)} \to {N a}_{(g)}^{+} + e^{-}$

Option 4 -

${A r}_{(g)} + e^{-} \to {A r}_{(g)}^{-}$ (Thermodynamics)

3 Views | Posted 3 months ago

Asked by Shiksha User

1 Answer

Answered by

alok kumar singh | Contributor-Level 10

3 months ago

Correct Option - 2

Detailed Solution:

Sol. $2 P b {({N O}_{3})}_{2} \overset{Δ}{?} 2 P b O + 2 {N O}_{2} + O_{2}$

$2 {N O}_{2} ? N_{2} O_{4}$ colourless

$N_{2} O_{4} + 2 N O ? 2 N_{2} O_{3}$

Oxidation state in $N_{2} O_{3}$ is +3

Sol. <math> <mn>2</mn> <mtext> </mtext> <mi mathvariant="normal">P</mi> <mi mathvariant="normal">b</mi> <msub> <mrow> <mrow> <mfenced separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfenced> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mover> <mrow> <mrow> <mo>? </mo> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">Δ</mi> </mrow> </mrow> </mover> <mn>2</mn> <mi mathvariant="normal">P</mi> <mi mathvariant="normal">b</mi> <mi mathvariant="normal">O</mi> <mo>+</mo> <mn>2</mn> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mo>+</mo> <msub> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> </math> <!- [endif]-><!- [endif]-> <math> <mn>2</mn> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mo>? </mo> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>4</mn> </mrow> </mrow> </msub> </math> colourless <math> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>4</mn> </mrow> </mrow> </msub> <mo>+</mo> <mn>2</mn> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">O</mi> <mo>? </mo> <mn>2</mn> <msub> <mrow> <mrow> <mtext> </mtext> <mi mathvariant="normal">N</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> </math> <!- [endif]-><!- [endif]->Oxidation state in <math> <msub> <mrow> <mrow> <mi mathvariant="normal">N</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> </math>  is +3

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The process that is NOT endothermic in nature is:

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