Question

The electrical resistance of a column of 0.05 M NaOH solution of area 0.8 cm² and length 40 cm is 5 × 10³ ohm. Calculate its resistivity, conductivity and molar conductivity.

Assertion (A) : For measuring resistance of an ionic solution an AC source is used. Reason (R) : Concentration of ionic solution will change if DC source is used.

Werner's coordination theory in 1893 was the first attempt to explain the bonding in coordination complexes. It must be remembered that this theory was put forward before the electron had been discovered by J.J. Thomson in 1897, and before the electronic theory of valency. Werner did not have any of the modern instrumental techniques and all his studies were made using simple experimental techniques. Werner was able to explain the nature of bonding in complexes and he concluded that in complexes, the metal shows two different sorts of valency : primary and secondary. Primary valences are normally ionisable whereas secondary valences are non ionisable. Answer the following questions :

Calculate the EMg²⁺/Mg potential for the following half cell at 25°C : Mg/Mg²⁺ (1 × 10⁻⁴ M); E°Mg²⁺/Mg = + 2·36 V [Given : log 10 = 1]