Import Question JSON

Current Question (ID: 18680)

Question:

$\text{The coordination number and oxidation number of Co in the complex}$ $\text{(NH}_4\text{)}_2[\text{CoF}_4] \text{ are:}$

Options:

1. $+2, 4$
2. $4, +2$
3. $6, +3$
4. $+3, 6$

Solution:

$\text{HINT: The co-ordination number of Co is 4 in (NH}_4\text{)}_2[\text{CoF}_4].$ $\text{Explanation:}$ $\text{STEP 1: Co-ordination number is the number of atoms, molecules, or ions}$ $\text{bonded to a central metal atom.}$ $\text{In the complex (NH}_4\text{)}_2[\text{CoF}_4], \text{ the central metal ion is Co.}$ $\text{The co-ordination number is 4 as it is having four F}^- \text{ ligands in the}$ $\text{coordination sphere.}$ $\text{STEP 2:}$ $\text{Let the oxidation number of Co is } x. \text{ NH}_4 \text{ ligand is having a } +1 \text{ charge, so the}$ $\text{charge on the complex will be } -2. \text{ So, the oxidation}$ $\text{number of Co can be calculated as:}$ $x - 4 = -2$ $x = +2$ $\text{Thus, Co is in a } +2 \text{ oxidation state.}$

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
}