(A) Emery is a natural rock that is used as an abrasive. It is composed primarily of corundum $(Al_2O_3)$ mixed with other minerals such as magnetite,

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(A) Emery is a natural rock that is used as an abrasive. It is composed primarily of corundum $(Al_2O_3)$ mixed with other minerals such as magnetite,hematite,or spinel. Therefore,it is considered an impure form of corundum.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Occurrence

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Emery consists of

A
Impure corundum
B
Impure carborundum
C
Impure graphite
D
Purest form of iron

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General Principles and Processes of Isolation of Elements

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Occurrence

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Emery consists of

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