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Current Question (ID: 18524)

Question:

$\text{A pair of metals among the following that can be purified by the van Arkel method are:}$

Options:

1. $\text{Zr, and Ti}$
2. $\text{Ag, and Au}$
3. $\text{Ni, and Fe}$
4. $\text{Ga, and In}$

Solution:

$\text{HINT: Zr and Ti are purified by van Arkel method.}$ $\text{Explanation:}$ $\text{STEP 1:}$ $\text{The Van Arkel method is a metallurgical method used to refine zirconium and titanium metal. The main impurity which is to be removed in this refining consists of oxygen and nitrogen.}$ $\text{These impurities are removed by heating the zirconium or titanium metal in an evacuated vessel containing iodine.}$ $\text{STEP 2:}$ $\text{The metal iodide being more covalent, and volatilize. The reaction is as follows:}$ $\text{Zr} + 2\text{I}_2 \rightarrow \text{ZrI}_4$ $\text{The metal iodide is decomposed on a tungsten filament, electrically heated to about 1800K. The pure metal deposits on the filament.}$ $\text{ZrI}_4 \rightarrow \text{Zr} + 2\text{I}_2$

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
}