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For a spontaneous process,
(a)enthalpy change of the system must be negative
(b)entropy change of the system must be positive
(c)entropy change of the surrounding must be positive
(d)entropy change of the system plus surrounding must be positive

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Important Questions on Thermodynamics
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and are, respectively, and at 298 K. The equilibrium constant for the reaction at 298 k is:

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at
Hence in is _____________.

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The standard free energy of the formation of is at . What is the standard free energy of the formation of at ?

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The surface of copper gets tarnished by the formation of copper oxide. gas was passed to prevent the oxide formation during heating of copper at 1250 K. However, the gas contains 1 mole % of water vapour as impurity. The water vapour oxidises copper as per the reaction given below:
Is the minimum partial pressure of (in bar) needed to prevent the oxidation at . The magnitude of value of is ____.
(Given: total pressure = 1 bar, R (universal gas constant) are mutually immiscible.
At
)
Round off the answer up to the nearest integer.

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At what temperature, a chemical reaction will have following values?

