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All ores are minerals while all minerals...

All ores are minerals while all minerals are not ores because :

A

the metal can't be extracted economically from all the minerals.

B

minerals are complex compounds

C

the minerals are obtained from mines.

D

All of these are correct.

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The correct Answer is:
A
the metal can.t be extracted economically from all the minerals.
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(a) All ores are minerals but all minerals are not ores. Justify. (b) An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain. (c ) An athlete won a bronze medal in a race competition. After some days, he found that the medal had lost its lustre due to the formation of a greenish layer on it. Name the metals present in the medal. What is the reason for the formation of a greenish layer on its surface ?

Statement-1: All ores are minaerals but all minerals are not ores. Statement-2: Minerals are obtained from mines.

Assertion (A): A mineral is called ore, when metal is extracted from it conveniently and economically. Reason (R): All ores are minerals but all minerals are not ores.

A mineral is called an ore if :

A : All the diverse minerals element found in plants are not essential for them. R : Some plants accumulate heavy and toxic minerals such as gold and selenium from the soil.

DISHA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE -1: CONCEPT APPLICATOR
  1. Consider the following reactions : 2XS+3O(2)overset(Delta)to 2XO+2SO...

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  2. XCl(2)("excess")+Ycl(2) to XCl(4)+Y darr , YO underset(gt400^(@))ove...

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  3. All ores are minerals while all minerals are not ores because :

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  4. Consider the following reaction at 1000^(@)C (A) Zn (s) + (1)/(2) O...

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  5. Correct match is:

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  6. Select correct statement:

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  7. By which process Pb and Sn are extracted respectively are:

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  8. Which of the following faction is of no significance for roasting sul...

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  9. When copper pyrites is roasted in excess of air, a mixture of CuO + Fe...

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  10. Sulphide ores of metals are usually concentrated by both floatation pr...

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  11. Calcination is the process in which

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  12. Extraction of zinc from zinc blende is achieved by

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  13. In froth flotation process many chemicals (frother, collector, activat...

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  14. In the metallurgy of Zn the Zn dust obtained from roasting and reducti...

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  15. A sulphide ore is first converted into its oxide before reduction. Thi...

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  16. Carbon and CO gas are used to reduce which of the following pairs of m...

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  17. While extracting an element from its ore, the ore is grind and leached...

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  18. Consider the following statements - In the aluminothermite process,...

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  19. Which statement is correct?

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  20. Aluminium is prepared in large quantities by

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