Q39 of 60 Page 33

Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid. What is the role of sulphuric acid in this reaction? Write the balanced chemical equation of this reaction.

In this reaction, sulphuric acid is working as a dehydrating agent.


Sulphuric acid has a property to attract water. It removes water from other compounds without dissolving in it. Thus it is considered a good drying agent.


The chemical equation of this reaction is as follows:


CH3CH2OH + hot conc. H2SO4 (at 443 K) → H2C = CH2 + H2


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37

Intake of small quantity of methanol can be lethal. Comment.

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A gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.

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Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with

(a) chlorine (Group 17 of periodic table)


(b) oxygen (Group 16 of periodic table)

 41

In electron dot structure, the valence shell electrons are represented by crosses or dots.

(a) The atomic number of chlorine is 17. Write its electronic configuration?


(b) Draw the electron dot structure of chlorine molecule.