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The standard free energy of formation of...

The standard free energy of formation of MgO AND CO at temperature `1000^(@)C and 2000^(@)C` are given below (they refer to the reaction involving one mole of oxygen at one atomsphere pressure) The free energy change to the reaction.
`2Mg+O_(2) to 2MgO " " DeltaG_(1000^(@)C)=-941kJ//mol`
`" "DeltaG_(2000^(@)C)=-341kJ//mol`
`2C+O_(2) to 2CO " " DeltaG_(1000^(@)C)=-439kJ//mol`
`" "DeltaG_(2000^(@)C)=-628kJ//mol`

A

At `1000^(@)C` temperature

B

At `2000^(@)C` temperature

C

Both a and b

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`2MgO+2C to 2Mg+CO`
`" " DeltaG_("Reaction")=DeltaG_(CO)-DeltaG_(MgO)`
`At 1000^(@)C,DeltaG=-439+941 gt 0("Non-spontaneous")`
`At 2000^(@)C,DeltaG=-439+941 gt 0("spontaneous")`
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