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Match the items of Column I with items of Column II and assign the correct code.

Column I

Column II

A.              Sapphire

1.            Al2O3

B.             Sphalerite

2.            NaCN

C.             Depressant

3.            Co

D.             Corundum

4.            ZnS

5.            Fe2O3

 Codes

           A         B          C          D

1.       3          4           2           1

2.       5          4           3           2

3.       2          3           4           5

4.       1          2           3           4

 

 

Hint: NaCN is a Depressant 
A. Corundum (Al2O3) is one of the hardest substances known and is therefore used as an abrasive; many gemstones are impure forms of Al2O3 eg ruby (Cr), sapphire (Co) etc.

Sapphire is a gemstone that contains Co.


B. Molecular formula of sphalerite is ZnS.


C. NaCN is used as a depressant in the froth floatation method.


D. Molecular formula of corundum is Al2O3 . 

Hence, an option first is the correct answer.

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