1.

DeltaG^@ vs T plot in the Ellingham's diagram slopes downward for the reaction

Answer»

`Mg+(1)/(2)O_(2)to MgO`
`2AG+(1)/(2)O_(2)to Ag_(2)O`
`C+(1)/(2)O_(2)to CO`
`CO+(1)/(2)O_(2)to CO_(2)`

Solution :
Reaction (i) : `M_((s))+(1)/(2)O_(2(g))rarr MO_((s))`(where M represents metal)
Reaction (ii): `CO_((g))+(1)/(2)O_(2(g))rarr CO_(2(g))`
Reaction (III) : `C_((s))+(1)/(2)O_(2(g))`
`Delta G^(@) vs` T PLOT in the Ellingham's diagram slopes downwards for the reaction (i) and reaction (ii).For reaction (iii), `Delta G^(@)vs` T plot in Ellingham's diagram slopes upwards.


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