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CBSE Class 12 Chemistry Notes: Ores and Metallurgy – Introduction

by Anand Meena
April 22, 2019
in 12th Class, Class Notes
Reading Time: 2min read
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The biggest source of metals is earth’s crust. Metals are also found in rocks, sea water, some impurities, etc depending upon their chemical nature. Less electropositive metals have less affinity for oxygen, moisture and hence occur in free or native or uncombined state, e.g. Au, Pt, Ag, etc. While the metals with higher electropositive character occurs in combined state as compounds.

The naturally occurring chemical substances in the earth’s crust which are obtained by mining are known as minerals. Minerals which can be used as a source for commercial recovery of a desired substance are termed as ores. Earthy substance associated with ores are called gangue.

Sixteen most abundant elements in the earth’s crust are given as:

CBSE Class 12 Chemistry Notes: Ores and Metallurgy

Some important compounds
CBSE Class 12 Chemistry Notes: Ores and Metallurgy

Some important alloys and their uses are as follows:
CBSE Class 12 Chemistry Notes: Ores and Metallurgy

Illustration 1.    (i)   List three metals that are found in nature as oxide ores.

                        (ii)   If earth had the atmosphere that contained only and no then what would be the composition of the minerals you would expect to find.

Solution:          (i)   Fe as

(ii)   , Oxide

Illustration 2.    An ore which does not contain oxygen is

(A) bauxite                                            (B)  haematite

(C) chalcopyrite                                     (D)  calamine

Solution:          (C)

Chalcopyrite is a sulphide ore.

CBSE Class 12 Chemistry Notes: Ores and Metallurgy

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Class 12 Chemistry Ores and Metallurgy All Topic Notes Class 12 Chemistry All Chapters Notes

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Tags: CBSE NotesClass 12 NotesClass 12thFree Notes

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

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