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2) The second question is basically the equation for the chlorination of water, the equation is:
Cl2(g) + H2O(l) -> HClO(aq) + HCl(aq)
The reason for that is, chlorine kills bacteria so the water is safe to drink.
3) The equation for third question is:
Cl2(aq) + 2NaOH(aq) -> NaClO(aq) + NaCl(aq) + H2O(l)
4) For my exam board, the first positive ion that came to my mind in this case is Ba2+ ions.
The ionic equation is just: Ba2+(aq) + SO42-(aq) -> BaSO4(s)
Whenever there is effervescence, carbonate is usually present and the gas produced in test 1 is therefore carbon dioxide.
And since the gas produced in test 2 turned the damp red litmus paper blue, the gas therefore is ammonia and the solution B consists of ammonium ions, NH4+, hence the ionic equation for the formation of ammonia, NH3, would be:
NH4+(aq) + OH-(aq) -> H2O(l) + NH3(g)
Intermolecular forces: https://www.chemguide.co.uk/atoms/bonding/vdw.html
Chlorination of water: http://www.chemguideforcie.co.uk/sec...earningij.html
Reaction of chlorine with cold sodium hydroxide solution: http://www.chemguideforcie.co.uk/sec...learningh.html
Tests for negative ions and halide ions: https://www.chemguide.uk/14to16/analysis/anions.html
Tests for positive ions: https://www.chemguide.uk/14to16/analysis/cations.html
Also check your specification to see which content you need to know, also check out https://chemrevise.org, it is a great website for chemistry revision