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Saturday, 30 December 2017

There are only two metals that are non-silver in colour, they are

  By GK Planet Team       Saturday, 30 December 2017
Q. There are only two metals that are non-silver in colour, they are

A. Nickel & Zinc
B. Copper & Gold
C. Palladium & Platinum
D. Sodium & Magnesium

Answer: Copper & Gold
Metals are coloured because the absorption and re-emission of light are dependent on wavelength. Gold and copper have low reflectivity at short wavelengths, and yellow and red are preferentially reflected. Silver has a good reflectivity that does not vary with wavelength and therefore appears very close to white.

Copper is a chemical element with symbol Cu (from Latin: cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a reddish-orange color.

Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions.
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