general factss from p block which can be asked in various entrance xam..

1. I₂ can be dissove in- KI but not in NaI.

2. correct order of electron gain enthalpy of halogens- I>Br>F> Cl.

3. the formula of mineral borax is Na₂B₄O₇.10H₂O

4. the product obtained at anode when 50% H₂SO₄ aq solution is electrolyse using platinum electrodes is H₂S₂O₈ and not H₂SO₃