Import Question JSON

Current Question (ID: 18521)

Question:

$\text{Which metal can be purified by zone refining?}$

Options:

1. $\text{Ni}$
2. $\text{Zr}$
3. $\text{In}$
4. $\text{Fe}$

Solution:

$\text{Hint: This method is very useful for producing semiconductors and other metals of very high purity}$ $\text{Explanation:}$ $\text{The method is based on the principle that the impurities are more soluble in the melt than in the solid-state of the metal.}$ $\text{Zone refining is based upon fractional crystallization as the impurity prefers to stay in the melt and on solidification only pure metals solidify on the surface of the melt.}$ $\text{In this process solubility of the impurities in the metal in molten and solid states is different. Metals like Si, Ge, Ga, B, and In of high purity are purified by this method.}$ $\text{This process is known as ultra-purification because it results in impurity levels decreasing to ppm-level.}$

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
}