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Question
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
Options:
A .  Accelerating the rate of scaling
B .  Causing metal embrittlement
C .  Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
D .  All A., B. and C.
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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