Which of the following orders is not correct?

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) $1$. Heat of atomisation: $Zn, Cd, Hg$ have low enthalpies of atomisation due to their $d^{10}$ configuration. The order is $Zn > Cd > Hg$ because

Vedclass · Accepted Answer

$HgCl_2 > CdCl_2 > ZnCl_2$ (Ionic character)

Vedclass · Answer

(D) $1$. Heat of atomisation: $Zn, Cd, Hg$ have low enthalpies of atomisation due to their $d^{10}$ configuration. The order is $Zn > Cd > Hg$ because metallic bonding strength decreases down the group. This is correct.$2$. Acidic strength: Acidic character of oxides increases with the oxidation state of the metal. $Mn$ in $Mn_2O_7$ is $+7$,in $MnO_2$ is $+4$,and in $MnO$ is $+2$. Thus,$Mn_2O_7 > MnO_2 > MnO$ is correct.$3$. Oxidising nature: Oxidising power decreases down the group in the same oxidation state for $Cr, Mo, W$. Thus,$CrO_3 > MoO_3 > WO_3$ is correct.$4$. Ionic character: According to Fajan's rule,smaller cations have higher polarising power,leading to more covalent character. $Zn^{2+}$ is the smallest,so $ZnCl_2$ is the most covalent and $HgCl_2$ is the most ionic. The correct order of ionic character is $HgCl_2 > CdCl_2 > ZnCl_2$. Wait,actually,$HgCl_2$ is covalent due to high polarising power of $Hg^{2+}$. The order of ionic character is $ZnCl_2 > CdCl_2 > HgCl_2$. Therefore,the given order $HgCl_2 > CdCl_2 > ZnCl_2$ is incorrect.

Column-$I$	Column-$II$
$A$. $Pb_3O_4$	$I$. Neutral oxide
$B$. $N_2O$	$II$. Acidic oxide
$C$. $Mn_2O_7$	$III$. Basic oxide
$D$. $Bi_2O_3$	$IV$. Mixed oxide

Similar Questions

For the four successive transition elements $(Cr, Mn, Fe, \text{ and } Co)$,the stability of $+2$ oxidation state will be in which of the following order?
(Atomic numbers: $Cr = 24, Mn = 25, Fe = 26, Co = 27$)

Fill in the blanks:
$(a)$ The only $Mn$ halide compound that shows an oxidation state of $+7$ is ........
$(b)$ The $E^{\ominus}_{M^{II}/M}$ value is maximum negative for ........ in the $3d$ series.
$(c)$ Between $Cr^{2+}$ and $Fe^{2+}$,the stronger reducing agent is ........

Identify the correct statement about properties of interstitial compounds.

Which of the following oxidation states of manganese exhibits the most powerful oxidizing property?

Match the formulas given in Column-$I$ with the type of oxide given in Column-$II$ and select the correct option:-

Column-$I$ Column-$II$

$A$. $Pb_3O_4$ $I$. Neutral oxide

$B$. $N_2O$ $II$. Acidic oxide

$C$. $Mn_2O_7$ $III$. Basic oxide

$D$. $Bi_2O_3$ $IV$. Mixed oxide

Vedclass Test Series

Exam Paper Generator

Online Exam Module