The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

Number of paramagnetic oxides among the following given oxides is ____________.

Li₂O, CaO, Na₂O₂, KO₂, MgO and K₂O

Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d⁵ :

The molar solubility of Zn(OH)₂ in 0.1 M NaOH solution is x $$\times$$ 10^$$-$$18 M. The value of x is _________ (Nearest integer)

(Given : The solubility product of Zn(OH)₂ is 2 $$\times$$ 10^$$-$$20)