What is efflorescence ?

1.	What is efflorescence ?
A.	Formation of white patches on the brick surface due to insoluble salts in the brick clay
B.	Swelling of brick due to presence of carbonaceous matter and gas
C.	Deformation of brick due to exposure to rain
D.	Impurities in the brick clay which show after burning
Answer» B. Swelling of brick due to presence of carbonaceous matter and gas

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What is efflorescence ?

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