question_answer

  Assign a reason for each of the following statements : (i) Phosphorus () is more reactive than nitrogen ().                                                                                              1 (ii) Sulphur in vapor state exhibits paramagnetism.                                                                                                          1 (iii) Conc.  turns yellow on exposure to sunlight.                                                                                   1

Answer:

                (i) Phosphorus is more stable than nitrogen because of angle strain in molecule where the angles                 are only 60° rather than 109°28' (due to tetrahedral shape).                                                                                         Nitrogen is inert at room temperature because of high bond enthalpy of N = N bond.                                                                                     (ii) In vapour state sulphur exists as 83 molecule which has two unpaired electrons in the antibonding orbitals like Og and hence exhibit paramagnetism.                                                                                                                                   1 (iii) Nitric acid decomposes which is brown colour in which makes turns yellow.                         1