1.

MatchtheitemsofColumnIwithitems ofColumn IIandassignthecorrect code:{:(, "Column I",,,"Column II"),((A), "Pendulum",,(1),"Chromesteel"), ((B),"Malachite",,(2), "Nickelsteel"), ((C ), "Calamine",,(3), Na _3 AlF_ 6 ), ((D), "Cryolite",,(4), CuCO _3. Cu(OH)_2), (,,,(5), Zn CO_ 3):}

Answer»

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

Solution :Explanation.Nickelsteelhas negligiblecoefficientofexpanstionand HENCE itisusedfor makingpendulum.Malchite, ` CuCO_3 . CU(OH)_ 2`isanoreofcopper.Calamine isactually` ZnCO _3`andcryoliteis` N a _ 3AlF_6`.


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