155. In Hydrogen atom, electron is present in 6th energy level, which is/are correct about the Hydrogen spectrum? i) Total 15 emission lines are observed in spectrum ii) 4 emission lines belong to Lyman series and 5 emission lines belong to Balmer series iii) 2 emission lines belong to Brackett series and 3 emission lines belong to Paschen series iv) One emission line belongs to Humphrey series