Import Question JSON

Current Question (ID: 8449)

Question:

$\text{Which of the following is/are the Lewis acids?}$ $(\text{i}) \text{ BF}_3 \quad (\text{ii}) \text{ H}_2\text{O} \quad (\text{iii}) \text{ H}^+ \quad (\text{iv}) \text{ AlCl}_3$

Options:

1. $\text{Only (i)}$
2. $\text{(i) and (ii) only}$
3. $\text{(i), (iii), and (iv) only}$
4. $\text{All of the above}$

Solution:

$\textbf{Hint: } \text{Electron deficient species is Lewis acid.}$ $\textbf{Explanation:}$ $\text{A Lewis acid is a chemical species that contains an empty orbital that is capable of accepting an electron pair from a Lewis base to form a Lewis adduct.}$ $\textbf{Step 1:}$ $\text{BF}_3 \text{ and AlCl}_3 \text{ are electron-deficient compounds, so will accept an electron.}$ $\text{H}^+ \text{ is electron-deficient and cation so that it will accept electrons.}$ $\textbf{Step 2:}$ $\text{H}_2\text{O} \text{ molecule is having 2 lone pair of electrons so it cannot be a Lewis acid.}$ $\text{KAlF}_4 \text{ salt can be formed by combining AlF}_3 \text{ with KF.}$

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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
}