A) 1.5\[\Omega \]
B) 2\[\Omega \]
C) 2.5\[\Omega \]
D) 3.5\[\Omega \]
Correct Answer: C
Solution :
\[N{{i}^{3+}}=\left[ Ar \right]3{{d}^{7}}4{{s}^{0}}\Rightarrow 3\text{unpaired electrons}\] \[CuS{{O}_{4}}+2Kl\to Cu{{l}_{2}}+{{K}_{2}}S{{O}_{4}}\] \[2Cu{{l}_{2}}\to \underset{\text{Cuprous iodide}}{\mathop{2Cul}}\,+{{l}_{2}}\] \[S{{c}^{3+}}>C{{r}^{3+}}>F{{e}^{3+}}>M{{n}^{3+}}\] \[C{{r}^{3+}}>M{{n}^{3+}}>F{{e}^{3+}}>S{{c}^{3+}}.\] On solving these equation, \[\text{ }\!\!\Delta\!\!\text{ }{{\text{T}}_{\text{b}}}\text{=}\frac{\text{1000 }\!\!\times\!\!\text{ }{{\text{k}}_{\text{b}}}\text{ }\!\!\times\!\!\text{ w}}{\text{W }\!\!\times\!\!\text{ M}}\]
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