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ICSE Class 10 Answered

1)WHICH PROPERTY OF H2SO4 ACCOUNTS FOR ITS USE AS A DRYING AGENT? 2)CONCENTRATED H2SO4 IS BOTH AN OXIDISING AGENT AND A NON VOLATILE ACID. WRITE 1 EQUATION TO ILLUSTRATE THE ABOVE MENTIONED PROPERTIES OF H2SO4
Asked by cbiswajit | 20 Dec, 2018, 06:15: PM
answered-by-expert Expert Answer
1) H2SO4 is used as dehydrating agent.
 
    H2SO4 has a great affinity for water. It readily removes elements of water from other compounds.
 
2)
    (a) Conc. H2SO4 as an oxidising agent:
 
         The oxidising property of concentrated sulphuric acid due to the fact that on thermal decomposition, it yields nascent oxygen [O].
 
             H2SO4 → H2O +  SO2 +[O]
 
         Nascent oxygen oxidises metals, non-metals and inorganic compounds.
 

        a.  Non-metals

             C + 2H2SO4 → CO2 + 2H2O +2SO2

            S + 2H2SO4 → 2H2O +3SO2

 

        b.  Metals

             Cu + 2H2SO4 → CuSO4 + 2H2O +SO2

             Zn + 2H2SO4 → ZnSO4 + 2H2O +SO2

 

       c.  Inorganic compounds

            2HBr + H2SO4 →Br2 + 2H2O + SO2

           H2S + H2SO4 → S + 2H2O + SO2

    (b)  Non-volatile nature

         It has a high boiling point, so it is used to prepare volatile acids such as HCl, HNO3 and acetic acid from their salts by double decomposition.

            NaCl + H2SO4 →NaHSO4 + HCl

            NaNO3 + H2SO4 →NaHSO4 + HNO3

            CH3COONa + H2SO4 →NaHSO4 + CH3COOH

Answered by Varsha | 21 Dec, 2018, 12:31: PM

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