Import Question JSON

Current Question (ID: 8243)

Question:

$\text{The enthalpy of formation of all elements in their standard state is-}$

Options:

1. $\text{Unity}$
2. $\text{Zero}$
3. $\text{Less than zero}$
4. $\text{Different for each element}$

Solution:

$\textbf{Hint:} \text{The enthalpies of all elements in their standard states are taken as zero.}$\n\n$\text{The standard state of an elementary substance means the most stable form of that substance at } 298 \, \text{K temperature and } 1 \, \text{bar pressure. The enthalpies of all elements in their standard states are taken as zero.}$\n\n$\text{Therefore, option (2) is correct.}$

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
}