Import Question JSON

Current Question (ID: 18770)

Question:

$\text{Zero magnetic moment of the octahedral complex } \text{K}_2[\text{NiF}_6] \text{ is due to:}$

Options:

1. $\text{Low spin } d^6 \text{ Ni(IV) complex}$
2. $\text{Low spin } d^8 \text{ Ni(II) complex}$
3. $\text{High spin } d^8 \text{ Ni(II) complex}$
4. $\text{High spin } d^6 \text{ Ni(IV) complex}$

Solution:

$\text{HINT: Ni is in +4 oxidation state.}$ $\text{STEP 1: In } \text{K}_2[\text{NiF}_6], \text{ let oxidation number of Ni is } \text{''x''}$ $x + 6(-1) = -2$ $x = +4$ $\text{So, Ni is in +4 oxidation state i.e. } 4s^0 3d^6 \text{ configuration. That means pairing will happen.}$ $\text{STEP 2: So, Zero magnetic moment is due to low spin } d^6 \text{ Ni(IV) complex}$ $\text{STEP 3:}$ $\text{CFSE depend on the nature of the ligand, oxidation number of metal and geometry, which decides the low or high spin complex.}$ $\text{so do not focus on only one part ie on ligands.}$

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}