Complete the following chemical equations:
(i) Ca3P2+H2O→
(ii) Cu+H2SO4 (conc.) →
OR
Arrange the following in order of property indicated against each set:
(i) HF,HCl,HBr, HI : increasing bond dissociation enthalpy
(ii) H2O,H2S,H2‌Se,H2‌Te, increasing acidic character.