Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Predict the product of electrolysis in the following:

An aqueous solution of AgNO₃ with platinum electrodes.

Predict the product of electrolysis in the following:

A dilute solution of H₂SO₄ with platinum electrodes.

Predict the product of electrolysis in the following:

An aqueous solution of CuCl₂ with platinum electrodes.

How much electricity is required in coulomb for the oxidation of 1 mol of H₂O to O₂?

How much electricity is required in coulomb for the oxidation of 1 mol of FeO to Fe₂O₃?

Using the standard electrode potentials, predict if the reaction between the following is feasible:

\[\ce{Fe^{3+}_{ (aq)}}\] and \[\ce{I^-_{ (aq)}}\]

Using the standard electrode potentials, predict if the reaction between the following is feasible:

\[\ce{Ag^+_{ (aq)}}\] and Cu_(s)

Using the standard electrode potentials, predict if the reaction between the following is feasible:

\[\ce{Fe^{3+}_{ (aq)}}\] and \[\ce{Br^-_{ (aq)}}\]

Using the standard electrode potentials, predict if the reaction between the following is feasible:

\[\ce{Ag_{(s)}}\] and \[\ce{Fe^{3+}_{( aq)}}\]

Using the standard electrode potentials, predict if the reaction between the following is feasible:

\[\ce{Br2_{(aq)}}\] and \[\ce{Fe^{2+}_{( aq)}}\] 

Explain: 

Zone refining

Explain column chromatography.

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What is meant by the term “chromatography”?

What criterion is followed for the selection of the stationary phase in chromatography?

Describe a method for refining nickel.

Outline the principles of refining of metals by the following method:

Vapour phase refining

[Fe(H₂O)₆]³⁺ is strongly paramagnetic whereas [Fe(CN)₆]³⁻ is weakly paramagnetic. Explain.

Explain [Co(NH₃)₆]³⁺ is an inner orbital complex, whereas [Ni(NH₃)₆]²⁺ is an outer orbital complex.

[At. No.: Co = 27, Ni = 28]