This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Kinetics of Reduction of Iron Oxides by CO and H2”.
1. How many times does the reduction by H2 is faster than by CO?
a) 10-20 times
b) 20-30 times
c) 5-10 times
d) 2-5 times
View Answer
Explanation: Numerous fundamental investigations have confirmed that H2 is better reducing agent than CO. Reducing agent reduce iron oxide and itself gets oxidized.
2. Haematite is more reducible than magnetite.
a) True
b) False
View Answer
Explanation: When haematite is reduced to magnetite, additional porosity develops which enhances the rate of further reduction of haematite. Hence, haematite is more reducible.
3. With respect to gas composition, the rate is __________
a) first order & reversible
b) first order & irreversible
c) second order & reversible
d) second order & irreversible
View Answer
Explanation: Various experiments and modellings are carried out which confirms the first order & reversible rate of reaction with respect to gas composition.
4. The overall rate of reaction would depend on ___________
a) temperature, gas composition, size of the particle
b) temperature, gas composition
c) gas composition, size of the particle
d) temperature only
View Answer
Explanation: All these factors affect the rate of the reaction. Any change in their value result inchange in the rate of reaction.
5. Topochemical reduction with a sharp interface is obtained__________
a) when pore diffusion is faster than chemical reaction
b) when pore diffusion is slower than chemical reaction
c) when pore diffusion rate is comparable with chemical reaction rate
d) when pore diffusion is too much slower than chemical reaction
View Answer
Explanation: Topochemical reduction with a sharp interface pattern is obtained when pore diffusion is slower than chemical reaction. Depending on the situation (particles size, temperature, reduction rate, porosity) different types of pattern are obtained.
Sanfoundry Global Education & Learning Series – Iron Making.
To practice all areas of Iron Making, here is complete set of 1000+ Multiple Choice Questions and Answers.
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