Question

Identify A, B, C,D and E in the following sequence of reactions zinc sulphate in the presence of A give rise to zinc carbonate in the presence of B give rise to zinc nitrate in the presence of C give rise to zinc Hydroxide in the presence of D give rise to zinc oxide in the presence of E give rise to zinc sulphate

Answer 1

ZnSO4(aq) + Na2CO3(aq) → Na2SO4(aq) + ZnCO3(s)

                           (A)

ZnCO3(s) + HNO3  → Zn(NO3)2 + H2O + CO2

                     (B)

Zn(NO3)2 + 2NaOH → Zn(OH)2 + 2NaNO3

                       (C)

Zn(OH)2 -------------$Thermal Decomposition\\Heat$> ZnO + H2O

                                           (D)

ZnO + H2SO4 → ZnSO4 + H2O

               (E)

Answer 2

Answer:

a- na2co3 , b - hno3 , c- naoh , d thermal decomposition  , e - h2so4

Explanation:

1.znso4+na2co3 gives znco3+ na2so4

2.znco3+ 2hno3 gives zn(no3)2+ h20+ co2

3. zn(no3)2+ 2naoh gives zn(oh)2+ 2nano3

4. zn(oh)2(on heating ) gives zno + h20

5 zno +h2so4 gives znso4 + h20