What property of conc H2SO4 I is used in the action when sugar turns black in its presence II allows it to be used in the preparation of HCl and hno3 acids?

40.

Making use only of a substance chosen from those given below:

Dilute                                      sulphuric acid sodium carbonate

Zinc                                         sodium sulphite

Lead                                         calcium carbonate

Give the equation for the reaction by which you could obtain:

(i)  Hydrogen

(ii)  Carbon dioxide

(iii)  Zinc carbonate (two steps required)

i)  Zn +H2SO4 ---> ZnSO4 +H2

ii)   Na2CO3 +H2SO4 ----> Na2SO4­ +H2O +CO2

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