NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

(i) Which allotrope of phosphorus is more reactive and why ?

(ii) How the supersonic jet aeroplanes are responsible for the depletion of ozone layers ?

(iii) F2 has lower bond dissociation enthalpy than Cl2. Why ?

(iv) Which noble gas is used in filling balloons for meteorological observations ?

(v) Complete the equation :

      XeF2+PF5              

                                                   (5 marks)

(i)    White Phosphorus because it is less stable due to angular strain               12+12 marks

(ii)    Nitrogen oxides emitted by supersonic jet planes are responsible for depletion of ozone layer.

        Or NO+O3NO2+O2                                        (1 marks)

(iii)   due to small size of F, large inter electronic repulsion / electron- electron repulsion among the

        lone pairs of fluorine                                                              (1 marks) 

(iv)   Helium                                                                             (1 marks)

(v)    XeF2+PF5[ XeF ]+[ PF6 ]                                             (1 marks)

Difficulty Level:

  • 77%
  • 8%
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