Q1 of 45 Page 544

Name the method used for the purification of metals of high reactivity. What does a blue flame of burner indicates?

The electrolytic Refining is used for the purification of metals of high reactivity.


The blue flame of burner indicates that the saturated hydrocarbon are burnt due to the their complete combustion.


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8

Explain the concept of sustainable development.

 9

Arrange the following elements in the increasing order of their atomic radii.

Li, Be, N and F

 2

Name the elements which has:

(i) a total of three shells with three electron in its valence shells.


(ii) Half as many electronic in its third shell as in its second shell.

 3

(i) Name the bond formed when X714 combines with Y918 .

(ii) Write the chemical formula of the compound formed when X714 combines with Y918 .