Identify the ore that contains both Ca and Mg.

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Limestone

Dolomite

Chalk

Feldspar

answer is B.

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Detailed Solution

concept - Most metals do not exist in pure forms but as ores in nature. Many metals are not stable in the earth's crust, so they stabilize by interacting with other elements, and this interaction leads to the formation of ores.
Limestone: Limestone is an ore that contains large amounts of calcium carbonate.
Dolomite: Dolomite is just another type of limestone. These ores contain large amounts of calcium and magnesium.
Chalk: Chalk is also a type of limestone. Unlike limestone, chalk does not contain calcium carbonate as its main compound, but contains another compound known as calcite, which is also used to extract calcium.
Feldspar: Feldspar ores can be either plagioclase or orthoclase. The first type contains a large amount of calcium and sodium, while the second is rich in potassium. Thus, Dolomite is the ore, that contains both Ca and Mg.
Hence, the correct option is (2).

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