MCQ
Inert gases have positive electron gain enthalpy. Its correct order is
- A$Xe < Kr < Ne < He$
- B$He < Ne < Kr < Xe$
- ✓$He < Xe < Kr < Ne$
- D$He < Kr < Xe < Ne$
So, order is $Ne > Kr > Xe > He$
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$A$. They exhibit high enthalpy of atomization as the d-subshell is full.
$B$. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and + $II.$
$C$. Compounds of $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature.
$D$. $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals.
Choose the most appropriate from the options given below:
| List $I$ | List $II$ |
| $P.$ $PbO _2+ H _2 SO _4 \xrightarrow{?} PbSO _4+ O _2+$ other product | $1.$ NO |
| $Q.$ $Na _2 S _2 O _3+ H _2 O \xrightarrow{?} NaHSO _4+$ other product | $2.$ $I_2$ |
| $R.$ $N _2 H _4 \xrightarrow{\text { ? }} N _2+$ other product | $3.$ Warm |
| $S.$ $XeF _2 \xrightarrow{?} Xe +$ other product | $4.$ $Cl _2$ |
Codes: $ \quad P \quad Q \quad R \quad S $
Reaction : $X\xrightarrow{{'Y'}}CHC{l_3} + Z$