The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is/are:

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Solution

At 500–800 K (lower temperature range in the blast furnace):
$3 F e_{2} O_{3} hematite + C O \to 2 F e_{3} O_{4} + C O_{2}$
$F e_{3} O_{4} + C O \to 3 F e + 4 C O_{2}$
$F e_{2} O_{3} + C O \to 2 F e O + C O_{2}$
At 900 -1500 K (higher temparature range in the blast furnace):
$C + C O_{2} \to 2 C O;$
$F e O + C O \to F e + C O_{2}$
So, the number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite are 2

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