Column-I (Reaction)		Column-II (Slope in Ellingham diagram)
I)	$\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)$	A)	Straight line parallel to x-axis
II)	$2\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2\mathrm{CO} \left(\mathrm{g}\right)$	B)	Negative slope
III)	$2\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{CO}}_2\left(\mathrm{g}\right)$	C)	Positive slope
IV)	$2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2\mathrm{MgO}\left(\mathrm{s}\right)$	D)	Straight line parallel to y-axis

 

 

 

 

 

 

 

 

 

 

 

 

 

Graph is plotted between

${\mathrm{\Delta }}_{\mathrm{f}}^0\mathrm{G}$  of oxides (y-axis) vs temperature (x-axis)
The correct match between column-I and column -II is

	I	II	III	IV
1)	A	B	C	C
2)	A	B	C	D
3)	A	C	B	C
4)	A	B	C	B