73) If Gold is deposited on a surface of 200 square millimeter area, to an average thickness of 6 micrometer, the mass deposited Gold would be _____ mg. The specific gravity of Gold is 19.32.

74) The ratio of the amount of metal actually dissolved to the theoretical amount calculated, expressed in percentage is the

75) In _____ analysis, the interaction between matter and any portion of the electromagnetic spectrum is used.

76) Which can be electrodeposited from a water-based bath.

77) A rectangular park has perimeter 80 m and area 400 square meter. Its length and breadth in meters are