The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3…

JAMB 1980

The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10^-6m³ of water is made of

A. zinc

B. brass

C. copper

D. gold

E. silver

Correct Answer: Option B

Explanation

Density of the metal ornament = Mass of the metal ornament/Volume of the water displaced

D = 0.425/(50 × 10^-6)

D = 8500Kg/m³

R.D = density of object/density of water

R.D =8500/1000

R.D = 8.5

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