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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
Which of the following has highest melting point
  • A
    $BeCl_2$
  • B
    $MgCl_2$
  • ✓
    $CaCl_2$
  • D
    $BaCl_2$
✓

Answer

Correct option: C.
$CaCl_2$
c
${\text{I}}{{\text{E}}_1} \Rightarrow \mathop {{\text{Li}}}\limits_{2{s^1}} \quad \mathop {{\text{Be}}}\limits_{2{s^2}} \quad \mathop {\text{B}}\limits_{2{p^1}} \quad \mathop {\text{C}}\limits_{2{p^2}} $

Order $\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}$

in gaseous form reducing power $\propto \frac{1}{\mathrm{I} . \mathrm{E}}$

in aq. medium size $\Rightarrow \mathrm{Li}^{+}>\ldots \ldots>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$

$\therefore$ ionic mobility $\propto \frac{1}{\mathrm{H.R}}$

$\mathrm{EA} \Rightarrow$ as per data

$\mathrm{S}>\mathrm{Se}>\mathrm{Te}>\mathrm{Po}>\mathrm{O}$

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$CH _{2} = C = C H - C H _{3}$

$\quad 1\quad \quad 2\quad \quad 3\quad \quad \quad 4$

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