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NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 32
Total: 74
Write balanced equations for the following :
(i) NaCl is heated with sulphuric acid in the presence of MnO‌2.
(ii) Chlorine gas is passed into a solution of NaI in water.
Solution:  
(i)MnO2+H2SO4→MnSO4+H2O+O
[NaCl+H2SO4→NaHSO4+HCl]×2
‌‌‌‌‌‌‌‌2HCl+O→H2O+Cl2
–––––––––––––––––––––––––––––––––––––––––––––––––––––––– 2NaCl+MnO2+3H2SO4→2NaHSO4+MnSO4+2H2O+Cl2
(ii) Cl will replace I
2NaI(aq)+Cl2(g)→2NaCl(aq)+I2(s)
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