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When a brick is immersed in water for 24 hours and then dried, if. | |
A. | no grey or white deposits appear on the surface, the brick is free from soluble salts [Wrong Answer] |
B. | 10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence [Wrong Answer] |
C. | 50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence [Wrong Answer] |
D. | All the above. [Correct Answer] |