The maximum temperature that can be achieved in blast furnace is :

The correct option is upto 2200 K.

Step-by-step Explanation:

A blast furnace is a chimney-like structure used for smelting to extract metals, primarily iron, from its ores. Inside the blast furnace, temperature variations occur at different zones or heights of the furnace.

1. Zone of Combustion (Lower Part):
Near the bottom of the blast furnace, oxygen-rich air is blown in, which reacts with carbon (coke) in a highly exothermic reaction:

$C+O_2\to C{O}_2+\text{Heat}$

Because of this intense combustion, the temperature in this lowest zone reaches the maximum limit inside the blast furnace, which is approximately 2200 K (or about 1900 °C to 2000 °C).

2. Zone of Reduction (Upper Part):
As the hot gases rise, they react with incoming raw materials and lose heat. The temperature decreases gradually towards the top of the furnace, dropping to around 500 K – 800 K in the reduction zone.

Thus, the maximum temperature that can be achieved in a blast furnace is in the combustion zone at the bottom, which is upto 2200 K.