Magnesium, calcium and strontium are Group II elements.
) Calcium reacts with cold water to form two products:
a colourless gas, P, which 'pops' with a lighted splint
a weakly alkaline solution, Q, which turns milky when carbon dioxide is bubbled through it.
(i) Name gas P.
(ii) Identify the ion responsible for making solution Q alkaline.
(iii) Suggest the pH of solution Q.
(iv) Write a chemical equation for the reaction of calcium with cold water.