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NCERT Class XII Chemistry
Chapter - The p-Block Elements
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Question : 32 of 74
Marks: +1, -0
Write balanced equations for the following :
(i) NaCl is heated with sulphuric acid in the presence of MnO2_{2}.
(ii) Chlorine gas is passed into a solution of NaI in water.
Solution:  
(i) MnO2+H2SO4→MnSO4+H2O+O\text{(i) }\mathrm{MnO}_2 + \mathrm{H}_2\mathrm{SO}_4 \rightarrow \mathrm{MnSO}_4 + \mathrm{H}_2\mathrm{O} + \mathrm{O}
[NaCl+H2SO4→NaHSO4+HCl]×2\left[ \mathrm{NaCl} + \mathrm{H}_2\mathrm{SO}_4 \rightarrow \mathrm{NaHSO}_4 + \mathrm{HCl} \right] \times 2
                2HCl+O→H2O+Cl2\;\;\;\;\;\;\;\;2\mathrm{HCl} + \mathrm{O} \rightarrow \mathrm{H}_2\mathrm{O} + \mathrm{Cl}_2
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−----------------------------------------------- 2NaCl+MnO2+3H2SO4→2NaHSO4+MnSO4+2H2O+Cl22\mathrm{NaCl} + \mathrm{MnO}_2 + 3\mathrm{H}_2\mathrm{SO}_4 \rightarrow 2\mathrm{NaHSO}_4 + \mathrm{MnSO}_4 + 2\mathrm{H}_2\mathrm{O} + \mathrm{Cl}_2
(ii) Cl will replace I
2NaI(aq)+Cl2(g)→2NaCl(aq)+I2(s)2\mathrm{NaI}_{(aq)} + \mathrm{Cl}_{2(g)} \rightarrow 2\mathrm{NaCl}_{(aq)} + \mathrm{I}_{2(s)}
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