The d & f Block Elements — Chemistry STD 12 Science — Question

Two half-reactions of an electrochemical cell are given below:
MnO₄^- (aq) + 8 H⁺ (aq) + 5e^– → Mn²⁺ (aq) + 4H₂O (l), E^o = +1.51 V,
Sn²⁺ (aq) → Sn⁴⁺ (aq) + 2e^–, E^o = +0.15 V.
Construct the redox reaction equation from the two half-reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured.

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution?

Classify the following into monosaccharides and disaccharides. Ribose, 2-deoxyribose, maltose, galactose, fructose and lactose.

State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obeys Raoult’s law at all concentrations.

The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.

Explain Hell-Volhard-Zelinsky reaction of carboxylic acids.

Answer the following questions:
Illustrate the following reactions:

1. Hoffmann bromamide degradation reaction.
2. Coupling reaction.