Which of the following is endothermic-H - gt- H-1-OR-O - gt- O2-1-give reason

The question has some error. It should be second electron affinity of oxygen. nbsp; Always electron affinity is an nbsp;exothermic reaction, since the ele ...

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Standard XII

Chemistry

Wittig Ylid

which of the ...

Question

which of the following is endothermic:-
H ---> H^-1
OR
O ----> O₂^-1
give reason

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Solution

The question has some error. It should be second electron affinity of oxygen.
Always electron affinity is an exothermic reaction, since the electrons are added to the neutral atom. Whereas the second electron affinity is positive that means energy is needed since its very tough to add one more electron to the already created negative ion. So second electron affinity of oxygen is positive.

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Similar questions

In the following pair which is more acidic?

C H_{2} FC H_{2} C O_{2} H, C H_{3} CHMFCHC O_{2} H

Q. Identify the following reactions as endothermic or exothermic
(i)

2 N a H C O_{3} + H e a t e n e r g y \to N a_{2} C O_{3} + H_{2} O + C O_{2}

(ii)

2 M g + O_{2} \to 2 M g O + e n e r g y

Q. The reaction of heated graphite with superheated steam is endothermic;

C (g r a p h i t e) + H_{2} O (g) \to C O g) + H_{2} (g) 1

The heat required for this reaction is provided by burning part of the graphite;

C (g r a p h i t e) + O_{2} (g) \to C O_{2} (g); △ H^{\circ} (500 K) = - 393.7 k J m o l^{- 1} 2

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What is

△ H^{\circ} (500 K)

for reaction (1) ?

Q. The formation of the oxide ion

O^{2 -}

involves first an exothermic step followed by an endothermic step as shown below:

O + e^{-} \to O^{-}; Δ H = - 142 k J m o l^{- 1}

O^{-} + e^{-} \to O^{2 -}; Δ H = 844 k J m o l^{- 1}

This is because :

S + O_{2} \to {S O}_{2}; △ H = - 298.2 k J

{S 0}_{2} + 1 / 20_{2} \to {S O}_{3}; △ H = - 98.7 k J

S O_{3} + H_{2} O \to H_{2} {S O}_{4}; △ H = - 130.2 k J

H_{2} + 1 / 20_{2} \to H_{2} O; △ H = - 287 k J

Then the enthalpy of formation of

H_{2} {S O}_{4}

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which of the following is endothermic:- H ---> H-1 OR O ----> O2-1 give reason

which of the following is endothermic:-
H ---> H^-1
OR
O ----> O₂^-1
give reason