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BITSAT2012ChemistryThermodynamics (C)Actual

In which of the following reactions, standard entropy change ( S ^ ) is positive and standard Gibb's energy change ( G ^ ) decreases sharply with increasing temperature?

Options

  1. AC (graphite) + 1 2 O ₂( ~g ) CO ( g )
  2. BCO ( g )+ 1 2 O ₂( ~g ) CO ₂( ~g )
  3. CMg ( s )+ 1 2 O ₂( ~g ) MgO ( s )
  4. D1 2 C (graphite) + 1 2 O ₂( ~g ) 1 2 CO ₂( ~g )

Correct answer

A. C (graphite) + 1 2 O ₂( ~g ) CO ( g )

Step-by-step solution

Since, in the first reaction gaseous products are forming from solid carbon hence entropy will increase i.e. S =+ ve . C ( gr .)+ 1 2 O ₂( ~g ) CO ( g ) ; S ^ =+ ve Since, G ^ = H ^ - T S hence the value of G decrease on increasing temperature.

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