MCQ
Which of the following complexes is diamagnetic
- ✓$Ni{(CO)_4}$
- B$Ni{(C{l_4})^{2 - }}$
- C$Ni(Br)_4^{2 - }$
- D$NiC{l_2}.4{H_2}O$
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$(A)$ The $M ^{3+} / M ^{2+}$ reduction potential for iron is greater than manganese
$(B)$ The higher oxidation states of first row $d$ block elements get stabilized by oxide ion.
$(C)$ Aqueous solution of $Cr ^{2+}$ can liberate hydrogen from dilute acid.
$(D)$ Magnetic moment of $V ^{2+}$ is observed between $4.4-5.2\,BM$
Choose the correct answer from the options given below:

$I-$ acid catalysed hydration
$II-$ $HBO$
$III-$ oxymercuration-demercuration