Which one of the following ionic compounds would be insoluble in water?

a. none of the compounds are insoluble.

b. kno3

c. pb(no3)2

d. agno3
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None of the compounds are insoluble in water out of given options.

Option: A

Explanation:  

Solubility of any compound is favored in water when it is bonded ionically or show ionic behavior Polarity of water , which is unequal sharing of electrons among its atom actually allows it to be a most popular solvent. is an inorganic salt and carry ions as is an inorganic compound showcase ionic behavior as  

is also an inorganic and ionic salt break as . Here when polar or ionic compound is added into water, they break up in smaller components and dissolve by connecting positive ion of solute with negative ion of solvent and negative ion of solute with positive ion of solvent.

i know insulin is primary but i dont know the others im sorry

explanation:

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.