Mineral and Ores
Mineral and Ores
Occurrence of metals in nature:
Metals occur in nature in free state or in combined state. A metal is said to occur native or free when it is found in nature in the metallic state.
For example: Gold may be found in nature as metal. This is because gold when left exposed to air practically does not undergo any change. It is not reacted upon by moisture, oxygen and carbon dioxide of the air. Thus, those metals which remain unaffected by moisture, oxygen and carbon dioxide of the air can occur native or free. In other words, the unreactive metals occur in nature in Free State because of their low reactivity towards chemical reagents. Another example of an unreactive metal is silver. The reactive metals, i.e, the metals which react with moisture, oxygen, carbon dioxide or other chemical reagents, are not found in nature in free state, but in combined state in the form of compounds called Minerals.
Minerals:
Metal – bearing substances, found in the earth crust, are called minerals. In other words, the solid compounds of metals occurring in nature are called minerals. For example,
Which of these metals often occurs naturally in the pure state? | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following substances can be profitably extracted from ores ? | |||
| Right Option : D | |||
| View Explanation | |||
The element or compound , which occur naturally in the Earth 's crust are know as ______________ | |||
| Right Option : C | |||
| View Explanation | |||
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