Which of the following metals are extracted by reducing their metal oxides using carbon?

Q. Which of the following metals are extracted by reducing their metal oxides using carbon?

Q. Carbon and $CO$ gas are used to reduce which of the following pairs of metal oxides for extraction of metals?

Q. Metals like sodium, potassium, calcium and magnesium are extracted by electrolysis of their chlorides in molten state. These metals are not extracted by reduction of their oxides with carbon because:
a) Reduction with carbon is very expensive
b) Carbon readily makes alloys with these metals
c) Carbon has less affinity for oxygen than these metals
d) Carbon is a weaker reducing agent than these metals

Q. A black metal oxide XO₂ is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO₂ is also used in ordinary dry cells. The metal oxide XO₂ cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO₂.
(c) Which reducing agent can be used to reduce XO₂ to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.