At what temperature is more kcl able to dissolve: 40°c or 90°c? (you don't have to give out a paragraph, but also explain why, so that i may understand)

I believe it would be 90° c, This is because solubility increases with increase in temperature, and therefore more solute would dissolve at a higher temperature. Hence, more KCl will dissolve at a temperature of 90°C as compared to a temperature of 40° C.

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.