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The formation of water from H(2)(g) and ...

The formation of water from `H_(2)(g)` and `O_(2)(g)` is an exothermic process because :

A

The chemical energy of `H_(2)(g)` and `O_(2)(g)` is more than that of water

B

The chemical energy of `H_(2)(g)` and `O_(2)(g)` is less than that of water

C

The temperature of `H_(2)(g)` and `O_(2)(g)` is higher than that of water

D

The temperature of `H_(2)(g)` and `O_(2)(g)` is lower than that of water

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The correct Answer is:
A
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The formation of the oxide ion O_((g))^(2-) requires first an exothermic and then an endothermic step as shown below. O_((g)) +e^(-) = O_((g))^(-) DeltaH^(@) =- 142 kJ mol^(-1) O_((g))^(-) + e^(-) = O_((g))^(2-) DeltaH^(@) = 844 kJ mol^(-1) This is because of :

ALLEN-THERMODYNAMICS -EXERCISE -3
  1. Which of the following reaction is endothermic?

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  2. Which one of the reaction is an exothermic reaction

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  3. The formation of water from H(2)(g) and O(2)(g) is an exothermic proce...

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  4. Which plot represents for an exothermic reaction ?

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  5. Which of the following are applicable for a thermochemical equation ? ...

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  6. The correct thermochemical equation is :

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  7. The enthalpy changes of formation of the gaseous oxides of nitrogen (N...

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  8. Delta H for transition of carbon in the diamond form to carbon in the ...

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  9. Which respresent an exothermic reaction :-

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  10. Which of the following value of DeltaH(f)^(@) represent that the produ...

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  11. S(("rhombic"))+O(2(g))rarr SO(2(g)) , Delta H =-297.5 K J S(("monocl...

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  12. Heat of formation, Delta H(f)^(@) of an explosive compound like NCl(3)...

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  13. According to the following reaction C(S)+1//2O(2)(g)rarr CO(g), Delta ...

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  14. Which of the following represents an exothermic reaction :-

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  15. The heat change during the reaction 24g C and 128g S following he chan...

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  16. For the reaction ,3O(2)rarr 2O(3),DeltaH=+ve. We can say that :

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  17. From the reaction P(White) rarr P(Red) Delta H =-18.4KJ, it follows th...

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  18. In Kirchoff's equation which factor affects the heat of reaction :

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  19. For the reaction , H(2)(g)+1//2O(2)(g)=H(2)O(l), Delta C(p)=7.63 "cal/...

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  20. The enthalpy of a reaction at 273 K. is -3.57 KJ. What will be the ent...

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