Question

Which one of the following statements is true?

The heat of solution in H2O for KOH is the same as that for KOH • H2O.

For a compound to spontaneously dissolve in H2O at 25 °C, the solution process must be exothermic.

Ne is less soluble in H2O at 2 atm pressure than at 1 atm pressure.

C2H4 is very soluble in liquid NH3.

None of the above.

Answer 1

CILI Answer. let analyse each stalement. 7 The heat of solution of KOH. H, 0 luhon in in is H₂O for koh same as that H2O This is a false statement. Heat of solchon is enthalpy Change associated with solure dissolving into soluhon. reason for difference in heat of solution is that KOH.H₂O have already some water in its crystal ore process of dissokhon of anhydrous form (KOH) is more exothermic than dissolution of hydrate So we should except a difference in heat of solution. - 2 for a compound to spontaneously dissolve in A20 at 25 Solution process must be exothermic This is a false Statement. Just because a process is exothermic doesn't meat it will be spontaneous. In solvation of a compound in H₂O process has to be spontaneous ce from order to disorder or from high energy to low energy. There is possibility that a process can be endothermic and shill spontaneous so it H2O at a aton mon less soluble in les 3 we is at laton pressure. This statement is false. According, of a gas in solvent is directly one pressure of gas above sowent NC will be huice SONG false. According to henry's law, clubinly. solvent is directly propotional to partial e above sowent. so zaton of pressure uce soluble that at lalon.
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