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Current Question (ID: 17984)

Question:

$\text{Schottky defect occurs mainly in electrovalent compounds where:}$ $1. \text{ Positive ions have large sizes.}$ $2. \text{ Negative ions have small sizes.}$ $3. \text{ Positive and negative ions are of similar size.}$ $4. \text{ Positive ions are big and negative ions are small.}$

Options:

1. $\text{Positive ions have large sizes.}$
2. $\text{Negative ions have small sizes.}$
3. $\text{Positive and negative ions are of similar size.}$
4. $\text{Positive ions are big and negative ions are small.}$

Solution:

$\text{(3) HINT: Cations and anions are almost similar in size in Schottky defect.}$ $\text{Explanation:}$ $\text{In Schottky defect, an atom moves from the inside of the crystal to its surface, leaving behind an isolated vacancy.}$ $\text{Schottky defect occurs mainly in the electrovalent compounds where positive and negative ions are of similar size.}$ $\text{Some common examples of salts where Schottky defect is prominent include NaCl, KCl, KBr, CsCl, and AgBr.}$

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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
}