STD 11 - 2. structure of atom — NEET STD 11 Science — Question

$CaCO _3( s ) \rightleftharpoons CaO ( s )+ CO _2( g )$

For this equilibrium, the correct statement(s) is (are)

$(A)$ $\Delta H$ is dependent on $T$

$(B)$ $K$ is independent of the initial amount of $CaCO _3$

$(C)$ $K$ is dependent on the pressure of $CO _2$ at a given $T$

$(D)$ $\Delta H$ is independent of the catalyst, if any

$\underset{A}{\mathop{PhF}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{B}{\mathop{PhCl}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{C}{\mathop{PhBr}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{D}{\mathop{PhI}}\,$

$(I)\, Co(III)$ is stabilised in presence of weak field ligands, while $Co(II)$ is  stabilised in presence of strong field ligand. 

$(II)$ Four coordinated complexes of $Pd(II)$ and $Pt(II)$ are diamagnetic and  square planar.

$(III)\,[Ni (CN)_4]^{4-}$ ion and $[Ni (CO)_4]$ are diamagnetic tetrahedral and  square planar respectively. 

$(IV)\,Ni^{2+}$ ion does not form inner orbital octahedral complexes.