The efflorescence test for bricks determines the presence of which compounds?
- ALime and silica
- BSulfates and alkalisCorrect
- CAlumina and magnesium
- DIron oxide and calcium
Solution
Concept
Efflorescence
Step-by-step solution
1. Efflorescence is the white deposit of soluble salts on brick surfaces. 2. The salts are mainly sulphates and alkalis.
Explanation
The test checks the presence of soluble sulphates and alkalis in bricks.
Why the other options are wrong
Lime, silica, alumina, magnesium and iron oxide are not the salts.
Shortcut
Efflorescence = sulphates and alkalis.
Correct answer: B) Sulfates and alkalis