INDIAN GEOGRAPHY

MINERAL AND ENERGY RESOURCES IN INDIA

MINERALS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Metals are usually ____ substances
A
dull
B
brown
C
shiny
D
none of above
Explanation: 

Detailed explanation-1: -Metals are generally shiny, malleable, and hard, ductile. Metals are also good conductors of electricity, they produce sound when they hit with other substances(sonorous).

Detailed explanation-2: -All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.

Detailed explanation-3: -Metals reflect light-they are shiny, not dull. Metals conduct both heat and electricity well. Metals have a high melting and boiling point and are solids at room temperature (except mercury).

Detailed explanation-4: -(1) Emission of radiation or light energy by excited electrons makes a metal shiny in appearance. (2) The electrostatic forces of attraction between metal ions and the mobile electrons is called metallic bond. (3) The positive metal ions are surrounded by pool of electrons.

Detailed explanation-5: -Transition Metals are what we usually think of when we think of metals. They are hard and shiny, strong, and easy to shape. They are used for many industrial purposes. This group includes iron, gold, silver, chromium, nickel, and copper, some of which are also noble metals.

There is 1 question to complete.