Which of the following concerning the effects of temperature and pressure on solubility is/are correct?
1. all gases become more soluble in a liquid at a fixed pressure when the temperature of the liquid is increased.
2. the dissolution of an ionic compound in water may be exothermic or endothermic, depending on the initial temperature of the solution.
3. the solubility of a liquid in water generally is significantly effected by pressure changes of the system.

None of the options are correct.

Explanation:

1) when the temperature of the solution is increased the solubility of the gas in the liquid decreases , hence option 1 is incorrect.

2)The heat released by the dissolution of an ionic compound in water is heat of hydration of the compound and is independent of the initial temperature of the solution.

3) The solubility of a liquid in water is not affected significantly by the pressure changes in the system as gases only have a significant cahne in solubility with change in pressure.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons