Passage - VIII :
In this passage five observation are given. Question are asked with reference to the given observations
Observation (i) Gaseous oxygen 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)?

Options

A. because below a certain temperature `O_(2)(g)` is partially dimerized
B. the unpair electrons of `O_(2)(g)` is paired up in some `O_(2)` molecules
C. `O_(2)(g)` is partialy dissociated to atomic oxygen
D. `O_(2)(g)` is converted partially to ozone

Answer

B

Explanation

The unpair electrons of `O_(2)(g)` is paired up in some `O_(2)` molecules