168) Roasted iron ore is mixed with coke and limestone and smelted in blast furnace. Which among the following does not represent the correct answer about the reaction taking place in blast furnace?

In the lower part, called zone of fusion temperature (1773 K), coke burns to CO₂ producing 97000 calories of heat

In the middle part, limestone decomposes to give CO₂ and lime which acts as a reducing agent

In the middle part, called zone of heat absorption (1073 − 1273 K), CO₂ is reduced to CO

At the top is the zone of reduction (673 − 973 K). Here, iron oxide is reduced to spongy iron by CO

Answer is:

At the top is the zone of reduction (673 − 973 K). Here, iron oxide is reduced to spongy iron by CO

Answer is:

Answer is:

Answer is:

Answer is:

Explanation:

Ferrous salts decolourise an acidified solution of KMnO₄.