Identify the incorrect order of the given parameter - Vidyadip

MCQ

Identify the $incorrect$ order of the given parameter

A
$V > Ni > Mn$ (order of melting point)
B
$Co > Ni > Cu > Zn$ (order of melting point)
C
$Na_2S > ZnS > CuS$ (order of solubility in aqueous medium)
✓
$CuS > ZnS > Na_2S$ (order of solubility in aqueous medium)

✓

Answer

Correct option: D.

$CuS > ZnS > Na_2S$ (order of solubility in aqueous medium)

d
In $\mathrm{Mn}$, there is broken crystal lattice due to which its melting point is low. In vanadium, there are maximum number of unpaired electrons.

$Co$ and $Ni$ have lesser radii than $Cu$ and $Zn$. Also in $Co$ the number of unpaired electrons are more.

$\mathrm{Na}_{2} \mathrm{S}$ is ionic, soluble in water, has highest solubility. $\mathrm{K}_{\mathrm{sp}}$ of $\mathrm{ZnS}$ is higher than $CuS$, therefore, solubility is higher.

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