A coal with high ash content is undesirable, as________________?

A. causes its spalling due to different co-efficient of expansion/contraction of the refractory

B. boiler tubes thereby reducing the heat transfer

C. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber

D. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace

E. All A., B. and C.

F. the ash

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