Answer : Conductivity of electricity will be best observed in [tex]Sr_{3}( PO_{4} )_{2}[/tex]
Explanation : The electrical conductivity of any solution is best when it is composed of ionic molecules in it.
In the given options option A [tex]PCl_{3}[/tex] and option C [tex]NO_{3}[/tex] are covalently bonded compounds which cannot be ionic if dissolved in water.
Also in case of option B which is [tex]C_{6}H_{12}O_{6}[/tex] is an organic molecule which will not conduct electricity.
So the best option is [tex]Sr_{3}( PO_{4} )_{2} [/tex] which is an ionic molecule and will produce ions when dissolved in water and Hence conduct electricity.
