Write balanced chemical equations involved in the following reactions:(a) Fluorine gas reacts with water.(b) Phosphine gas is absorbed in copper sulphate solution.

(i) Fluorine gas reacts with water-Fluorine reacts violently with water forming hydrogen fluoride and oxygen gas is evolved.So the balanced chemical equation will be:2F2(g)+2H2O(l)→4HF(aq)+O2(g)
(ii) When phosphine gas is absorbed in copper sulphate solution, it gives black precipitate of cupric phosphide and sulphuric acid. So the balanced chemical equation will be.2PH3+3CuSO4→Cu3P2+3H2SO4