PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Describe the roles of the following: NaCN in froth floatation process

Silver crystallises in fcc lattice. If edge length of the cell is 4.07 × 10⁻⁸ cm and density is 10.5 g cm⁻³, calculate the atomic mass of silver.

Predict the product of electrolysis in the following:

An aqueous solution of \[\ce{AgNO3}\] with silver electrodes.

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