$A$ first row transition metal with the highest enthalpy of atomization,upon reaction with oxygen at high temperature,forms oxides of the formula $M_2O_n$ (where $n=3, 4, 5$). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is $......$ $BM$ (nearest integer). (Given atomic number: $Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26, Co: 27, Ni: 28, Cu: 29, Zn: 30$)
- A$1$
- B$2$
- C$3$
- D$0$
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Match List-$I$ with List-$II$:
List-$I$ (Transition metal/Compound/complex) List-$II$ (Catalytic Role) $A$. $V_2O_5$ $I$. Preparation of ammonia from $N_2/H_2$ mixture $B$. $Fe$ $II$. Polymerisation of alkynes $C$. $PdCl_2$ $III$. Preparation of $H_2SO_4$ from $SO_2$ $D$. $Ni$ complex $IV$. Oxidation of ethyne to ethanal
| List-$I$ (Transition metal/Compound/complex) | List-$II$ (Catalytic Role) |
| $A$. $V_2O_5$ | $I$. Preparation of ammonia from $N_2/H_2$ mixture |
| $B$. $Fe$ | $II$. Polymerisation of alkynes |
| $C$. $PdCl_2$ | $III$. Preparation of $H_2SO_4$ from $SO_2$ |
| $D$. $Ni$ complex | $IV$. Oxidation of ethyne to ethanal |
MediumNEET 2026
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