A) \[{{I}_{2}}(g)\rightleftharpoons 2I(g),\Delta H_{r}^{o}(298K)=+150kJ\]
B) \[I\]
C) \[{{I}_{2}}\]
D) \[{{N}_{2}}{{O}_{5}}(g)\xrightarrow{{}}2N{{O}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\]
Correct Answer: B
Solution :
Among the given metal ions only \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] forms complex with \[Cr{{O}_{3}}\] having co-ordination number 2. \[N{{H}_{3}},P{{H}_{3}},As{{H}_{3}}\] Coordination number of metals is defined as the number of \[\sigma \] bonds by which ligands are attached to the metal atom.
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