Which salt is least soluble in water at 20c

Answer - Potassium chlorate

Explanation-

Composition of oxygen potassium and chlorine makes a salt named potassium chlorate. It finds its use in many areas like disinfectant oxidizing agents explosives etc.

or potassium Chlorate has a low solubility in water hence among all other salts at 20 degree centigrade this one has the least chances of dissolving in it.

Since increase in temperatures are responsible for increase in solubility of many others it also happens with but compared to others even increase temperature solubility is lesser from others.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.