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) .

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

i need mutiple choices