MX₂ dissociates in M²⁺ and X^- ions in an aqueous solution, with a degree of dissociation ($$\alpha$$) of 0.5. The ratio of the observed depression of freezing point of the aqueous solution to the value of the depression of freezing point in the absence of ionic dissociation is

In a galvanic cell, the salt bridge

A list of species having the formula XZ₄ is given below.

XeF₄, SF₄ ,SiF₄, $$BF_4^-$$, $$BrF_4^-$$, [Cu(NH₃)₄]²⁺, [FeCl₄]^2-, [CoCl₄]^2- and [PtCl₄]^2-

Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is

In an atom, the total number of electrons having quantum numbers n = 4, |m_l| = 1 and m_s = –1/2 is