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Current Question (ID: 7689)

Question:

$\text{The group of metals having the positive value of electron gain enthalpy is:}$

Options:

1. $\text{Cr, Fe}$
2. $\text{Mn, Zn}$ (Correct)
3. $\text{Fe, Zn}$
4. $\text{Cr, Mn}$

Solution:

$\text{HINT: If the element has half-filled and fully filled subshells then it has positive electron gain enthalpy.}$\n\n$\text{Explanation:}$\n\n$\text{The configuration of given elements are as follows:}$\n\n$\text{Cr = [Ar] 3d}^5\text{ 4s}^1$\n\n$\text{Mn = [Ar] 3d}^5\text{ 4s}^2$\n\n$\text{Fe = [Ar] 3d}^6\text{ 4s}^2$\n\n$\text{Zn = [Ar] 3d}^{10}\text{ 4s}^2$\n\n$\text{Here, Mn has half-filled 3d orbitals and fully filled 4s orbital, and Zn has fully filled 3d orbital and 4s fully filled orbital. Hence, they didn't accept extra electrons because their stability gets disturbed. So, they have positive electron gain enthalpy.}$

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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
}