Building Materials
For obtaining vinyl chloride acetate, the method used, is

None of these
Co-polymerization
Addition polymerization
Condensation polymerization

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts
All listed here

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