The two steps acid treatments for the demineralization of coal are:
A. Aqua-regia to remove all metal salts and then is followed by a HCl treatment
B. NHO3 to remove all metal salts and then is followed by a HF treatment
C. H2SO4 to remove all metal salts and then is followed by a HCl treatment
D. HCl to remove all metal salts and then is followed by a HF treatment
Answer:D
The two steps acid treatments for the demineralization of coal are:
A. Aqua-regia to remove all metal salts and then is followed by a HCl treatment B. NHO3 to remove all metal salts and then is followed by a HF treatment C. H2SO4 to remove all metal salts and then is followed by a HCl treatment D. HCl to remove all metal salts and then is followed by a HF treatment