MCQ
Which forms interstitial compounds
- A$Fe$
- B$Co$
- C$Ni$
- ✓All of these
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In the above reaction $'A'$ is ....

$(A)$ It has two geometrical isomers
$(B)$ It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands
$(C)$ It is paramagnetic
$(D)$ It absorbs light at longer wavelength as compared to $\left[ Co ( en )\left( NH _3\right)_4\right]^{3+}$
Assertion $A$ : The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason $R$ : The four electrons in $2 p$ orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements, choose the correct answer from the options given below.