(a) chlorine (Group 17 of Periodic Table)

Ans. carbon tetrachloride (CCl₄)

(b) oxygen (Group 16 of Periodic Table)

Ans. Carbon dioxide (CO₂)

(a) The atomic number of chlorine is 17. Write its electronic configuration
Ans. Electronic configuration of chlorine: 2,8,7
(b) Draw the electron dot structure of chlorine molecule.
Ans. Electron dot structure of chlorine molecule:

Both carbon and silicon show the ability of catenation. But compounds made by silicon are reactive and less stable. On the other hand, bonds formed by carbon are very strong and hence organic compounds are more stable than silicon compounds. It can be said that carbon shows better catenation ability than silicon.

Saturated hydrocarbons generally burn with a clean flame. Unsaturated hydrocarbons burn with yellow flame and produce lot of soot. So, when ethane is burnt, it burns with a clean flame and no soot is produced. When ethene is burnt, it burns with yellow flame and produces lot of soot.

Match the reactions given in Column (A) with the names given in column (B).

 

 

Ans. (a)→(iv) (b)→(i) (c)→(ii) (d)→(iii)

you have named. Also, write chemical equation of the reaction involved. Ans. Salt X is sodium ethanoate and the evolved gas is carbon dioxide. Take a test tube and take ethanoic acid in it. Add sodium bicarbonate to the acid. Close the mouth of the test tube with a cork and attach a delivery tube to it. Take lime water in another test tube and attach this with another and of delivery tube.

You will observe that the lime water turns milky. This shows that the evolved gas is carbon dioxide. Following reaction takes place between ethanoic acid and sodium hydrogen carbonate.

CH₃ COOH + NaHCO₃ → CH₃ COONa + CO₂ + H₂ O