Which statement about Group 2 elements and their compounds is correct?
A saturated solution of magnesium hydroxide has a lower pH than a saturated solution of calcium hydroxide at the same temperature.
The first ionisation energy of Group 2 elements increases down the group because the outer electrons are in shell levels further from the nucleus.
In the industrial extraction of titanium from TiCl4\text{TiCl}_4TiCl4, magnesium acts as an oxidising agent.
The addition of excess dilute sulfuric acid to barium metal produces a highly soluble barium sulfate salt, forming a clear, colourless solution.
