When water boilers are used for long period of time; the solid substances left behind as scale are?

A. magnesium trioxosilicate (IV) and rust
B. magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
C. clay and magnesium troxosulphate (IV)
D. clay and rust

Correct Answer:

Option A – magnesium trioxosilicate (IV) and rust