Import Question JSON

Current Question (ID: 21537)

Question:

$\text{What is the outer electronic configuration of Gadolinium (Gd) with atomic number 64?}$

Options:

1. $4f^3\ 5d^5\ 6s^2$
2. $4f^8\ 5d^0\ 6s^2$
3. $4f^4\ 5d^4\ 6s^2$
4. $4f^7\ 5d^1\ 6s^2$

Solution:

$\text{Hint: Consider the stability of half-filled } 4f \text{ subshell in Gd's configuration.}$ $\text{Explanation:}$ $\text{Gadolinium is a chemical element; it has the symbol Gd and atomic number 64.}$ $\text{Gadolinium is a silvery-white metal when oxidation is removed.}$ $\text{It is a malleable and ductile rare-earth element.}$ $\text{Gadolinium reacts slowly with atmospheric oxygen or moisture to form a black coating.}$ $\text{The electronic configuration of Gadolinium is } [\text{Xe}]4f^7\ 5d^1\ 6s^2.\ \text{It has half-filled } 4f \text{ subshell.}$ $\text{So, the correct answer is option 4.}$

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
}