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NEET levelSingle correct optionDifficulty 1 of 3mt193

In the Ellingham diagram, which of the following lines has a negative slope?

A $2 Mg + O X_{2} 2 MgO$ (below the boiling point of Mg)
B $2 C + O X_{2} 2 CO$
C $C + O X_{2} CO X_{2}$
D $2 CO + O X_{2} 2 CO X_{2}$

Answer: B

The slope equals

- Δ S^{\circ}

. In

2 C + O X_{2} 2 CO

the gas moles rise from 1 to 2, so

Δ S^{\circ} > 0

and the slope is negative. The

CO X_{2}

line is nearly horizontal and the other two lines slope upward.

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