Assign the reason for the following :
Copper (I) ion is not known in aqueous solution.
Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
What are the transition elements ? Write two characteristics of the transition elements.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
When Cu²⁺ ion is treated with KI, a white precipitate is formed. Explain the reaction with the help of chemical equation.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.
Calculate the molality of ethanol solution in which the mole fraction of water is 0.88.
What is meant by rate of a reaction ? Differentiate between average rate and instantaneous rate of a reaction.
The following curve is obtained when molar conductivity is plotted against the square root of concentration, c½ for two electrolytes A and B :
Suggest reasons for the following features of transition metal chemistry :
(i) The transition metals and their compounds are usually paramagnetic.
(ii) The transition metals exhibit variable oxidation states.
Calculate pH of following half-cell. Pt, \(H_2\) / \(H_2\)\(SO_4\) , if its electrode potential is 0.03V.
(i) Write the colligative property which is used to find the molecular mass of macromolecules.
(ii) In non-ideal solution, what type of deviation shows the formation of minimum boiling azeotropes?
Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity