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Delhi - 2012
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Q18 of 55 Page 1

Complete the following equations

(i) CH4 + O2


(ii) C2H50H


(iii) CH3COOH + NaOH

The equations can be completed as follows:

(i) CH4 + 2O2CO2 + 2H2O + heat


(ii)


(iii) CH3COOH + NaOH CH3COONa + H2O


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6

What is meant by asexual reproduction. List its any two different forms. 2

10

The image of a candle flame placed at a distance of 36 cm from a spherical lens formed on a screen placed at a distance of 72 cm from the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 2.5 cm, find the height of the image.

11

An element 'M' has atomic number 12:

(a) Write its electronic configuration.


(b) State the group to which 'M' belongs.


(c) State the period to which 'M' belongs.


(d) State the valency of 'M'.


(e) Is 'M' a metal or a non-metal?


(f) Write the formula of its oxide.

17

Define the term 'Evolution'. "Evolution cannot be equated with progress." Justify this statement.

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Delhi - 2012
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