Chemical Engineering - Chemical Engineering Basics

26. 

The order of a chemical reaction

A. can be determined only experimentally
B. can be determined from the stoichiometry of the reaction.
C. can not be zero.
D. can be fractional.

Answer: Option B

Explanation:

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27. 

Pick out the wrong statement.

A. Lead can creep under its own weight at room temperature.
B. The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement.
C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal.
D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase.

Answer: Option C

Explanation:

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28. 

Pick out the wrong statement.

A. Reflectivity of gases is very low.
B. Absorptivity for metals is very high.
C. Reflectivity for non-conducting materials is low.
D. Reflectivity of polished surfaces is very high.

Answer: Option B

Explanation:

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29. 

For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be

A. 100% indirect reduction.
B. 100% direct reduction.
C. 50-60% indirect reduction.
D. 30-40% indirect reduction.

Answer: Option C

Explanation:

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30. 

Identify the false statement

A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels.
B. Pitting corrosion is usually very localised.
C. Hydrogen embrittlement is facilitated by tensile stress.
D. Stress corrosion cracking is facilitated by tensile stress.

Answer: Option A

Explanation:

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