Q1 of 61 Page 1

Write any one difference in the electronic configurations of group 1 and group 2 elements?

Group1 elements has only one electron in their outermost shell whereas group 2 elements have 2 electrons in their outermost shell.


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17

State the meaning of the functional group in an organic compound. Write the formula of the functional group present in alcohols, aldehydes, ketones and carboxylic acids.

 24

A student wants to project the image of a candle flame on the walls of school laboratory by using a mirror.

(a) Which type of mirror should he use and why?


(b) At what distance in terms of focal length 'f' of the mirror should he place the candle flame so as to get the magnified image on the wall?


(c) Draw a ray diagram to show the formation of image in this case.


(d) Can he use this mirror to project a diminished image of the candle flame on the same wall? State 'how' if your answer is 'yes' and 'why not' if your answer is 'no'.

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Write the contribution of Charles Darwin in the field of 'evolution'.

 3

"We need to manage our resources." List two reasons to justify this statement.