Import Question JSON

Current Question (ID: 18891)

Question:

$\text{The three lanthanides that show a } +2 \text{ oxidation state are:}$

Options:

1. $\text{Sm, Tb, Gd}$
2. $\text{Sm, Eu, Yb}$
3. $\text{La, Gd, Lu}$
4. $\text{Yb, Pm, Sm}$

Solution:

$\text{HINT: Sm, Eu, Yb}$ $\text{Explanation:}$ $\text{The lanthanides that exhibit } +2 \text{ are Sm, Eu, Yb}$ $\text{The oxidation state exhibited by elements can be seen as:}$ $\begin{array}{|c|c|} \hline +2 & +4 \\ \hline \text{Nd(60)} & \text{Ce(58)} \\ \text{Sm(62)} & \text{Pr(59)} \\ \text{Eu(63)} & \text{Nd(60)} \\ \text{Tm(69)} & \text{Tb(65)} \\ \text{Yb(70)} & \text{Dy(66)} \\ \hline \end{array}$

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
}