Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Complete the following equations:Cr₂O₇^2- + 2OH^- →

Complete the following equations : MnO₄- + 4H⁺ + 3e^- →

Complete the following equation : MnO₄^- + 8H⁺ + 5e^- →

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

Write the structure of 2-hydroxybenzoic acid.

Define the following term:

Essential amino acids

Complete the following chemical equation

Cr₂O₇^2- + 3Sn²⁺ + 14H⁺ →

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 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 potential, predict if the reaction between the following is feasible:

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

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

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

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

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

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

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

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

Br_2(aq) and \[\ce{Fe^{2+}_{( aq)}}\] 

Explain: 

Zone refining