d and f-Block E...

Electronic configurations of different elements are given below in the options. Based on their electronic configurations, choose the one having the highest ionisation energy.

Copper, in the aqueous solutions of its salts, almost invariably exists in the +2 oxidation state because

Choose the correct statement(s) about manganese from among the following:

a. Mn³⁺ is a reducing agent in its aqueous solution.
b. The oxidation state of manganese in its fluoride is +4 (MnF₄).
c. The oxidation state of manganese is observed in its fluorides because the electronegativity of fluorine is the highest.

To which of the following categories will the given reaction belong?

2Cu⁺ → Cu + Cu²⁺

An aqueous solution of KCN is added to a solution of ferrous salt. The complex formed is presented by

Some elements of 3d series are shown in the options. Choose the pair of elements with the highest and lowest melting points, respectively.

A metal gives two chlorides X and Y. X gives black precipitate with NH₄OH and Y gives white. With KI, Y gives red precipitate, which is soluble in excess of KI. X and Y respectively are