Question

6. Write the following in the form of balanced chemical equations:- (a) Calcium carbonate decomposes on heating to form calcium oxide and carbon – di – oxide. (b) When ammonium hydroxide is added to a solvent of iron (ll) Sulphate, a green ppt of iron (ll) hydroxide and ammonium Sulphate are formed. (c) When a nail of iron is added to a solution of copper Sulphate, iron (ll) Sulphate and copper metal are formed. (d) Zinc reacts with dil hydrochloric acid to form zinc chloride and hydrogen gas is liberated.

Answer 1

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Your answers
a. CaCO3 = CaO + CO2
b.2NH4OH + FeSO4 = Fe(OH)2 + (NH4)2SO4
c.Fe + CuSO4 = FeSO4 + Cu
d. Zn + 2HCl = ZnCl2 + H2
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Answer 2

The equation is ----

Lead (II) nitrate → Lead (II) oxide + Nitrogen dioxide + Oxygen

The balanced equation is----

2 Pb(NO3)2 (s) → 2 PbO (s) + 4 NO2 (g) + O2 (g)

The chemical name of white salt is Lead nitrate Pb(NO3)2.

The salt on heating produces brown fumes. This is so because the salt

contains nitrate ion. This salt can be any nitrate but if the residue

left after heating is yellow in colour it definitely implies that the salt is lead

nitrate.

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