Chemistry

A divalent metal ion with an atomic number (Z) of 25 is Mn²?
Mn²? (Z=25) has the electronic configuration: 3d? 4s? (n=5, five unpaired electrons).
The magnetic moment (μ) is calculated as: μ = √ [n (n+2)] = √ [5 (5+2)] = √35 = 5.92 BM.

In an aqueous medium, all alkali metal cations are converted into their hydrated form. More intensely positive cations have more hydration, and hence the size of the cation increases after hydration. Therefore, the Li? cation has a larger size in hydrated form and the least conductivity. The order of conductivity of alkali metal ions is: Li? < Na? < K? < Rb? < Cs?

Kindly consider the following figure

Kindly consider the following figure

Kindly consider the following figure

Except for option (D), all are the important characteristics of D? O. D? O is useful for the isotopic leveling effect in reaction mechanisms. The dielectric constants of H? O and D? O are respectively 80 and 60.

Solid sol is a colloidal system consisting of a gas dispersed in a solid, e.g., pumice stone, foam rubber.

Due to the larger size of the Cl-atom, the addition of an electron in the outermost orbit produces less electronic repulsion with respect to the F-atom. The following are the electron gain enthalpies in (KJ) of halogens:
F → -328, Cl → -349, Br → -325, I → -295

A central atom having two lone pairs and three bond pairs reflects sp³d hybridization and a corresponding T-shaped geometry.

This describes a nucleophilic aromatic substitution reaction. Aryl halides are very less reactive toward this reaction, so the reaction takes place at a high temperature, i.e., 623K, and high pressure of 300 atm.