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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ?

$(A)$ $Rb$ and $Cs$

$(B)$ $Na$ and $K$

$(C)$ $Ar$ and $Kr$

$(D)$ $I$ and $At$

Choose the correct answer from the options given below.

  • A
    $(A)$ and $(B)$ only
  • B
    $(B)$ and $(C)$ only
  • ✓
    $(A)$ and $(C)$ only
  • D
    $(C)$ and $(D)$ only
✓

Answer

Correct option: C.
$(A)$ and $(C)$ only
c
$Rb$ and $Cs$ have nearly same electron gain enthalpy electron gain enthalpy $=-46\,kj / ml$

$Ar$ and $Kr$ have same $\Delta H _{ eq }$. Value is $+96\,kj / ml$

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