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Those minerals which contain a very high percentage of a particular metal and from which metal can be profitably extracted are called ores.

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Hydrogen gas is evolved when a metal reacts with nitric acid.

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Copper reacts vigorously with dilute HCl.

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A solution of an ionic compound in water contains ions, which move to the opposite electrodes when electricity is passed through the solution.

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The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.