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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 cannot 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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(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.

DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Multiple Choice
  1. CN^(-) solution is used in the extraction of which metal ?

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  2. A cuprous ore among the following is :

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

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  4. The process used for the extraction of sodium is called :

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  5. The common method for the extraction of metals from the oxide ore is :

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  6. Which of the following is not an ore of iron ?

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  7. Which of the following processes is used in the extractive metallurgy ...

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  8. The method of zone refining of metals is based on the principle of :

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  9. Pb and Sn are extracted from their chief ore by :

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  10. Which of the following is not an ore of magnesium ?

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  11. Extraction of zinc from zinc blende is achieved by

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  12. Which of the following statements about the advantage of roasting of s...

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  13. Sulphide ores of the metals are usually concentrated by froth floatati...

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  14. Which of the following is not an ore of aluminium ?

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  15. Which of the following factors is of no significance for roasting sulp...

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  16. When compared to DeltaG^(@) for the formation of Al(2)O(3), DeltaG^(@)...

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  17. Native silver metal forms a water soluble complex with a dilute soluti...

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  18. Which method of purification is represented by the following equations...

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  19. Aluminium is extracted from alumina (Al(2)O(3)) by electrolysis of a m...

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  20. Which one of the following is a mineral of iron ?

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