(a) Give reasons for the following observations : 

(i) Halogens are strong oxidising agents.

(ii) Noble gases have very low boiling points.

(iii) O and Cl have nearly same electronegativity, yet oxygen forms H bond while Cl doesn’t.

(b) Complete and balance the following chemical equations :

(i)  \underset{(cold+dil.)}{NaOH}+Cl_{2}\rightarrow

(ii)  I^{-}(aq)+H_{2}O(l)+O_{3}(g)\rightarrow

 

 
 
 

Answers (1)

(a)

(i) Halogens are strong oxidising agents because they readily accept one electron to attain noble gas configuration

(ii) Noble gases have very low boiling points due to weak dispersion forces

(iii) O and Cl have nearly same electronegativity, yet oxygen forms H bond while Cl doesn’t due to smaller size of oxygen as compared to chlorine

(b) (i) 2NaOH + Cl2 \rightarrow NaCl + NaOCl + H2O

     (ii) 2I- (aq.) + H2O(l) +O3(g) \rightarrow I2(s) + O2(g) + 2OH- (aq.)

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