Q3 of 55 Page 1

Which class of chemical is linked to the decrease in the decrease in the amount of ozone in the upper atmosphere of the earth?

Chlorofluorocarbons (CFCs) is the class of chemical linked to the decrease in the amount of ozone in the upper atmosphere of the Earth. Chlorofluorocarbons results in the depletion of the ozone layer.


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1

Name the functional group present in each of the following organic compounds:

(i) C2H5Cl


(ii) C2H5OH

 2

What will we the color of the sky when it is observed from a place in the absence of any atmosphere?

 4

List two advantages of vegetative reproduction practiced in case of an orange plant.

 5

How can the valency of an elements be determined if its electronic configuration is known? What will be the valency of an elements to atomic number 9 (nine)?