MCQ
In $Fe_2(CO)_9$, the two iron atoms are
- Alinked only directly
- ✓linked directly along with $3\,CO$ molecules as bridging ligands
- Clinked only through $3\,CO$ molecules as bridging ligands
- Djoined through one $CO$ group as bridging ligands

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$(I)\,\,La(OH)_3$ is the least basic among hydroxides of lanthanides.
$(II) \,\,Zr^{4+}$ and $Hf^{4+}$ posses almost the same ionic radii.
$(III)\,\,Ce^{4+}$ can as an oxidizing agent
Which of the above is/are true ?
$\left.\left. K _3\left[ Fe ( CN )_6\right]( K ),\left[ Co \left( NH _3\right)_6\right] Cl _3( L ), Na _3[ Co \text { (oxalate })_3\right]( M ),\left[ Ni _2 H _2 O \right)_6\right] Cl _2( N ) \text {, }$ $K _2\left[ Pt ( CN )_4\right]( O ) \text { and }\left[ Zn \left( H _2 O \right)_6\right]\left( NO _3\right)_2( P ) $ the diamagnetic complexes are