MCQ
Select the incorrect statement
  • A
    $EDTA$ is flexidented ligand and it is used to remove lead poison presence in human body
  • During the extraction of $Ag$ from cyanide process $Zn-$ melt act as a oxidising agent
  • C
    Blue vitriol absorb orange red colour energy
  • D
    $[Co(en)_3]^{+3}$ form racemic mixture

Answer

Correct option: B.
During the extraction of $Ag$ from cyanide process $Zn-$ melt act as a oxidising agent
b
${\text{Na}}\left[ {{\text{Ag}}{{({\text{CN}})}_2}} \right] + \mathop {{\text{Zn}}}\limits^0  \to {\text{N}}{{\text{a}}_2}\mathop {\left[ {{\text{Zn}}{{({\text{CN}})}_4}} \right]}\limits^{ + 2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}  + {\text{Ag}} \downarrow $

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For a solution formed by mixing liquids $L$ and $M$, the vapour pressure of $L$ plotted against the mole fraction of $M$ in solution is shown in the following figure. Here $x_{L}$ and $x_M$ represent mole fractions of $L$ and $M$, respectively, in the solution. The correct statement(s) applicable to this system is(are)

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$[A]$ Attractive intermolecular interactions between $L-L$ in pure liquid $L$ and $M-M$ in pure liquid $M$ are stronger than those between $L-M$ when mixed in solution

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$[C]$ The point $Z$ represents vapour pressure of pure liquid $L$ and Raoult's law is obeyed when $x_{\mathrm{L}} \rightarrow 1$

$[D]$ The point $Z$ represents vapour pressure of pure liquid $M$ and Raoult's law is obeyed from $x_{L}=0$ to $x_{L}=1$

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