Which of the following has a negative slope?

1. C $\to$CO

2. Fe $\to$Fe₂O₃

3. Mg $\to$MgO

4. All of the above

Aluminium is used as a reducing agent in the reduction of :-

1. Cr₂O₃

2. SnO₂

3. ZnO

4. HgO

Consider the following reactions at 1000 ^oC.

(I) ZnS + 1/2O₂(g)  \(\xrightarrow[]{\Delta }\)  ZnO(g);  ∆G^o = -360 kJ mol^-1
(II) Cs + 1/2O₂(g)  \(\xrightarrow[]{\Delta }\) CO(g); ∆G^o = -460 kJ mol^-1  

Choose the correct statement about the above reactions at 1000 ^oC:

1. ZnO is more stable than CO

2. ZnO can be reduced to Zn by C

3. ZnO, and CO are formed at an equal rate

4. ZnO can not be reduced to Zn by C

The correct statement among the following is: 

Assertion : The reduction of a metal oxide is easier if the metal formed is in liquid state
at the temperature of reduction.

Reason : The value of entropy change +S of the reduction process is more on +ve side when the metal formed is in liquid state and the metal oxide being reduced is in solid state. Thus the value of ${∆}_{\mathrm{f}}{\mathrm{G}}^{°}$ becomes more on negative side.