Some properties of sulphuric acid are listed below. Choose the role played by sulphuric
acid as A, B, C or D which is responsible for the reactions (i) to (v). Some role/s may be
repeated.
A) Dilute acid (B) Dehydrating agent
C) Non-volatile acid (D) Oxidising agent
$$\ce{CuSO4.5H2O ->[conc. H2SO4] CuSO4 + 5H2O }$$
$$\ce{S + H2SO4(conc.) ->3SO2 + 2 H2O }$$
$$\ce{ NaNO3 + H2SO4(conc.) ->[\lt 200°C] NaHSO4 + HNO3}$$
$$\ce{MgO + H2SO4 -> MgSO4 + H2O }$$
$$\ce{Zn + 2H2SO4(conc.) ->ZnSO4 +SO2 + 2H2O }$$

Give balanced equations for the following reactions:

i. Dilute nitric acid and copper carbonate

ii. Concentrated hydrochloric acid and potassium permanganate solution

iii. Ammonia and oxygen in the presence of a catalyst

iv. Silver nitrate solution and sodium chloride solution

Zinc Sulphide and Sulphuric Acid

Select the correct answer from the list give in brackets:

i. An aqueous electrolyte consists of the ions mentioned in the list, the ion which could
be discharged most readily during electrolysis.
``\ce{[Fe2+, Cu2+, Pb2+, H+]}``.

ii. The metallic electrode which does not take part in an electrolytic reaction.
``\ce{[Cu, Ag, Pt, Ni]}``.

iii. The ion which is discharged at the anode during the electrolysis of copper sulphate
solutions using copper electrodes as anode and cathode.
``\ce{[Cu2+, OH-, SO4^2-, H+]}``.

iv. When dilute sodium chloride is electrolysed using graphite electrodes, the cation is
discharged at the cathode most readily.
``\ce{[Na+, OH-, H+, CI-]}``.

v. During silver plating of an article using potassium argentocyanide as an electrolyte,
the anode material should be ``\ce{[Cu, Ag, Pt, Fe]}``.