Import Question JSON

Current Question (ID: 8511)

Question:

$\text{The following pair constitutes a buffer is:}$

Options:

1. $\text{HNO}_2 \text{ and } \text{NaNO}_2$
2. $\text{NaOH and NaCl}$
3. $\text{HNO}_3 \text{ and } \text{NH}_4\text{NO}_3$
4. $\text{HCl and KCl}$

Solution:

$\text{HINT: Acidic buffer - mixture of weak acid and salt of weak acid.}$ $\text{Explanation:}$ $\text{A buffer solution is an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.}$ $\text{HNO}_2 \text{ and } \text{NaNO}_2 \text{ constitute an acidic buffer because } \text{HNO}_2 \text{ is a weak acid and } \text{NaNO}_2 \text{ is a salt of weak acid (HNO}_2\text{) and strong base (NaOH).}$

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
}