Passage - VIII : In this passage five observation are given. Question are asked with reference to the givenobservations Observation (i) Gaseousoxygen is colourless whereas liquid and solid oxygen are coloured substance. Observation (ii) When O_(2) is cooled below a certain temperature its paramagnetic character decreases. Observation (iii) In ice H_(2)O molecules are H bonded Observation (iv) Ozone is responsible for tailing of Hg(l) Observation (v) O_(3)(g) is almost unavailable in lower atmosphere Which of the following explain the observation (ii)?

Passage - VIII : In this passage five observation are given. Question

1.	Passage - VIII : In this passage five observation are given. Question are asked with reference to the givenobservations Observation (i) Gaseousoxygen is colourless whereas liquid and solid oxygen are coloured substance. Observation (ii) When O_(2) is cooled below a certain temperature its paramagnetic character decreases. Observation (iii) In ice H_(2)O molecules are H bonded Observation (iv) Ozone is responsible for tailing of Hg(l) Observation (v) O_(3)(g) is almost unavailable in lower atmosphere Which of the following explain the observation (ii)?
Answer» because below a CERTAIN temperature `O_(2)(g)` is PARTIALLY dimerized the unpair electrons of `O_(2)(g)` is paired up in some `O_(2)` MOLECULES `O_(2)(g)` is partialy dissociated to atomic oxygen `O_(2)(g)` is CONVERTED partially to ozone Solution :The unpair electrons of `O_(2)(g)` is paired up in some `O_(2)` molecules