MCQ
The compound not soluble in acetic acid is
- A$CaC{O_3}$
- B$CaO$
- ✓$Ca{C_2}{O_4}$
- D$Ca{(OH)_2}$
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$(I)$ they exhibit high enthalpies of atomisation as the $d-$ subshell is full
$(II)$ $zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+ I$ and $+ II$
$(III)$ Compound of $Zn,\,Cd$ and $Hg$, are paramagnetic in nature
$(IV)$ $Zn,\,Cd$ and $Hg$ are called soft metals
$Cl_2 + 2Y^-\to 2Cl^-+ Y_2$
The incorrect match regarding above reaction is