Select the option containing correct order of the given parameter - Vidyadip

MCQ

Select the option containing correct order of the given parameter

A
$C > Si > Pb > Ge$ (Order of reactivity with alkali)
B
$C > Pb > Ge > Si$ (Order of reactivity with alkali)
C
$[CoCl_3(NH_3)_3]\, >\, [CoCl(NH_3)_5]Cl_2\, > $ $ [Co(NH_3)_6]Cl_3\,>\, [CoCl_2(NH_3)_4]Cl$ (order of electrical conductivity.)
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$[Co(NH_3)_6]Cl_3\, >\, [CoCl(NH_3)_5]Cl_2\, > $$ [CoCl_2(NH_3)_4]Cl\, >\, [CoCl_3(NH_3)_3]$ (order of electrical conductivity.)

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Answer

Correct option: D.

$[Co(NH_3)_6]Cl_3\, >\, [CoCl(NH_3)_5]Cl_2\, > $$ [CoCl_2(NH_3)_4]Cl\, >\, [CoCl_3(NH_3)_3]$ (order of electrical conductivity.)

d
Acidic nature of $\mathrm{C},$ $Si, Ge$ and $Pb$ decreases down the group hence reactivity decreases.

Greater the number of ionsa, greater will be the electrical conductivity. $III$ gives $4$ ions, $II$ gives $3$ ions, $IV$ gives $2$ ions; $I$ does not give ions.

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