When Cu²⁺ ion is treated with KI, a white precipitate is formed. Explain the reaction with the help of chemical equation.
2Cu²⁺ + 4I⁻ → Cu₂I₂ + I₂
White ppt.
Cu²⁺ gets reduced to Cu⁺ while I⁻ oxidizes to I₂.
White ppt.
Cu²⁺ gets reduced to Cu⁺ while I⁻ oxidizes to I₂.
What are the transition elements ? Write two characteristics of the transition elements.
Assign the reason for the following :
Copper (I) ion is not known in aqueous solution.
What is meant by ‘disproportionation’ ? Give an example of a disproportionation reaction in aqueous solution.
Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.
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.
Explain boiling point elevation constant for a solvent or ebullioscopic constant.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
Assign the reason for the following :
Copper (I) ion is not known in aqueous solution.
Write the structure of an isomer of compound C₄H₉Br which is most reactive towards reaction.
How would you account for the following ? Many of the transition elements are known to form interstitial compounds.