Silica refractories__________________?

A. crack when subjected to sudden change of temperature
B. Cannot be used in the dome of hot blast stoves
C. Have lower thermal conductivity than fireclay bricks
D. All A., B. and C.

Pick out the wrong statement?

A. In a first order reaction, A → products; the reaction becomes slower as it proceeds, because
the concentration of A decreases and the rate is proportional to the concentration of A
B. Transition state theory approaches the problem of calculating reaction rates by concentrating
on the idea of activated complexes
C. According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
time of an eddy to the solute decreases

D. If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always
elementary

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