The various salts of _________are of central importance to the variou – McqOptions

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1.	The various salts of _________are of central importance to the various sulfite-based processes. The chemistry of sulfurous acid as a function of pH is very imp.
A.	Chlorine
B.	Sulphur
C.	Sulfurous acid
D.	Calcium
Answer» D. Calcium

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