Q. When a brick is immersed in water for 24 hours and then dried, if (Solved)
1. no grey or white deposits appear on the surface, the brick is free from soluble salts
2. 10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence
3. 50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence
4. All the above.
- d. All the above.