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Change in entropy is negative for...

Change in entropy is negative for

A

Bromine `(l)rarr`Bromine(g)

B

`C(s)+H_(2)O(g)rarrCO(g)+H_(2)(g)`

C

`N_(2)(g, 10atm)rarrN_(2)(g, 1 atm)`

D

`Fe(1 mol, 400K)rarrFe(1mol,300K)`

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The correct Answer is:
B
`DeltaS=SigmanDeltaS` (Products)`-SigmanDeltaS` (Reactants)
In option `(d)` change in entropy is negative because at higher temperature degree of randomess is high.
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In which can change in entropy is negative

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Statement: The thermodynamics functions which determines the spontaneity of a process is the free energy. For a process to be spontaneous, the change in free energy must be negative. Explanation:The change in free energy is related to the change in enthalpy and change in entropy. the change in entropy for a process must be always positive if it is spontaneous.

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A2Z-CHEMICAL THERMODYNAMICS-Entropy, Gibb'S Energy And Spontaneity Of Process
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  4. In which of the following reactions DeltaS is positive?

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  5. The molar enthlpy of fusion of water is 6.01KJ mol^(-1) . The entropy ...

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  6. When ice melts into water, entropy

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  7. The value of free energy change of an equilibrium process is

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  8. The standard entropies of N(2)(g),H(2)(g) and NH(3)(g) are 191.5, 192....

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  9. One mole of an ideal gas at 25^(@)C is subjected to expand reversible ...

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  10. The entropy change for the reaction given below is 2H(2)(g)+O(2)(g)r...

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  11. The a reaction to be spontaneous at all temperature

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  12. Which of the following statements is true? The entropy of the universe

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  13. Enthalpy of fusion of a liquid is 1.435Kcal mol^(-1) and molar entropy...

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  14. If S^(@) for H(2),Cl(2) and HCL are 0.13, 0.22 and 0.19KJK^(-1)mol^(-1...

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  15. If the enthalpy of vaporization for water is 198.5KJ mol^(-1) , the en...

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  17. For the reaction, X(2)O(4)(l)rarr2XO(2)(g),DeltaE=2.1Kcal , DeltaS...

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  18. The temperature at which the reaction, Ag(2)O(s)rarr2Ag(s)+1//2O(2)(...

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