Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from (a), (b), (c) and (d) (Atomic mass : N = 14, O = 16, Cu = 63).I.    1 molecule of oxygenII. 1  atom of nitrogenIII.  1  ×  10−10  g molecular weight of oxygenIV.   1  ×  10−10  g atomic weight of copper

(I)  1 molecule of oxygen∵    6  ×  1023  molecule  has  mass =  32  g∴   1  molecule of O2  has  mass=326  ×  1023=5.3  ×  10−23ga(II) 1 atom of nitrogen∵     6 ×  1023  atoms  of 'N' has  mass =14gm∴   1  atom of'N'  has  mass=14 6  ×  1023=2.3  ×  10−23gIII 1 ×  10−10  molecular  weight  of  oxygen = 10-10gm-moles                                           =32×10−10gmIV 1 ×  10−10g atomic  weight  of  copper=1×10-10gm-atoms                                                             = 63×10-10gmSo, order of increasing masses II < I < III < IV.