Question

The furnace lining is steel manufacture consists of
A.ZnO
B.$SiO_2$
C.MgO
D.$CaCO_3$

Answer 1

Hint: Furnace lining is a lining made of high-melting-point material that is used to line the inside walls of a furnace. recalcitrant A protective covering that covers an inside surface is known as lining or liner.

Complete answer:
A blast furnace's job is to chemically and physically reduce iron oxides into liquid iron, also known as "hot metal." The blast furnace is a massive steel stack with refractory brick lining, with iron ore, coke, and limestone poured on top and preheated air blown into the bottom.
To withstand higher temperatures inside the furnace, the furnace lining is made of steel and contains MgO.
Some furnaces have linings made of magnesium oxide. It's called a refractory material because it resists heat and maintains its strength even at extremely high temperatures. Magnesium oxide has a high melting point ($2852^oc$), which means it can withstand the high temperatures of a furnace.
MgO is highly valued as a refractory substance, or a solid that remains physically and chemically stable at high temperatures. It has high thermal conductivity and low electrical conductivity, which are both advantageous.
And hence the correct option is C.

Note:
Magnesium oxyhydroxide (MgO). Periclase is an inorganic compound found in nature as a mineral. It easily reacts with water in aqueous media to form magnesium hydroxide. It is used as an antacid and a mild laxative, as well as for a variety of other purposes.