1.

Matchtheitems ofColumn Iwiththeitems of Column IIandassignthecorrect code:{:(,"Column I",,, "Column II"),((A), "Sapphire",,(1), Al _ 2O _3),((B), "Sphalerite",,(2),NaCN),((C),"Depressant",,(3),Co),((D),"Corundum",,(4), ZnS), (,,,(5), Fe_2O_3):}

Answer»

A(3) `"" `B(4) `""`C(2)`""`D(1)
A(5) `"" `B(4) `""`C(3)`""`D(2)
A(2) `"" `B(3) `""`C(4)`""`D(5)
A(1) `"" `B(2) `""`C(3)`""`D(4)

SOLUTION :EXPLANATION. Thecolourofsapphireis duetoCo. SphaleriteisZnS. Depressantis NaCN. Corundumisactually` Al _ 2 O_ 3`.


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