Question

Choose the correct option for the statements given below

Statement-I: Ellingham diagram is used to check which metal compound is to be reduced by which reducing agent.

Statement-II: In the Ellingham diagram, as we move from left to right $∆\mathrm{S}$ increases.

• A. Both S-I and S-II are true
• B. S-I is true, but S-II is false
• C. S-I is false, but S-II is false
• D. Both S-I and S-II are false

Answer 1

The correct option is B

S-I is true, but S-II is false

S1: Ellingham diagram is used to check which metal oxide is to be reduced by which compound.

Explanation- The graph of metal that lies below the Ellingham diagram has more affinity towards oxygen, so we can predict which metal oxide can be reduced by using a particular compound Hence, the statement is true.

S2:In the Ellingham diagram, as we move from left to right $∆\mathrm{S}$ increases.

Explanation- the slope of the Ellingham diagram is equal to $-∆\mathrm{S}$. The slope is constant as the Ellingham diagram as it contains the straight line, it gets changed only when the phase gets changed, Therefore, it is false.

Hence (b) is correct