Import Question JSON

Current Question (ID: 18903)

Question:

$\text{What is produced when excessive diluted nitric acid is combined with potassium chromate?}$

Options:

1. $\text{Cr}_2\text{O}_7^{2-} \text{ and H}_2\text{O}$
2. $\text{Cr}^{3+} \text{ and Cr}_2\text{O}_7^{2-}$
3. $\text{CrO}_4^{2-}$
4. $\text{Cr}_2\text{O}_4^{2-}$

Solution:

$\text{HINT: Cr}_2\text{O}_7^{2-} \text{ will form which is pink in colour.}$ $\text{Explanation:}$ $\text{A solution of potassium chromate (K}_2\text{CrO}_4\text{), when treated with an excess of dilute nitric acid then it formed Cr}_2\text{O}_7^{2-} \text{ and H}_2\text{O.}$ $\text{Here oxidation of nitric acid does not take place because in nitric acid N is already present in its maximum oxidation state (+5).}$ $\text{The reaction is: } 2\text{K}_2\text{CrO}_4 + 2\text{HNO}_3 \rightarrow \text{K}_2\text{Cr}_2\text{O}_7 + 2\text{KNO}_3 + \text{H}_2\text{O}$

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
}