Mrignayani was doing the experiment of comparing reactivity of metals in the laboratory. She was given aluminium metal and was told to check reactivity by using four solutions as shown below. She would observe that reaction takes place in:
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Which of the following alloys contain non-metal as one of their constituents?
Brass
Bronze
Steel
Amalgam
(3)
Steel is an alloy which contains iron as a metal and carbon as a non-metal.
The elements or compounds which occur naturally in the earth crust are known as:
Ores
Minerals
Gangue
None of these
(2)
The elements or compounds which occur naturally in the earth crust are known as minerals. The mineral from which an element can be extracted easily and profitably is called an ore. The impurities or unwanted substances present in ore such as sand, rock etc. is known as gangue.
