According to reference table f, which of these
compounds is the least soluble in water?
(1) k2co3 (3) ca3(po4)2
(2) kc2h3o2 (4) ca(no3)2

- 3)

Explanations:- From solubility rules, all compounds of alkali metals are soluble. K(potassium) is an alkali metal and so potassium carbonate, potassium acetate both are soluble in water.

Also, from the solubility rules, nitrates are soluble, so calcium nitrate is also soluble.

So, the least soluble one will surely be calcium phosphate and also from the solubility rules, phosphates are insoluble(expect of alkali metals and ammonium ion).

Hence, the right answer is 3) .

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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14 days is the half-life of phosphorus-32