Import Question JSON

Current Question (ID: 8306)

Question:

$\text{Select the correct option based on statements given below:}$ $\text{Assertion (A): Combustion of all organic compounds is an exothermic reaction.}$ $\text{Reason (R): The enthalpies of all elements in their standard state are zero.}$

Options:

1. $\text{Both (A) and (R) are True and (R) is the correct explanation of (A).}$
2. $\text{Both (A) and (R) are True but (R) is not the correct explanation of (A).}$
3. $\text{(A) is True but (R) is False.}$
4. $\text{(A) is False but (R) is True.}$

Solution:

$\text{Hint: Combustion is an exothermic reaction}$ $\text{Combustion of organic compounds is always exothermic. Heat or enthalpy of formation of natural elements in their standard state is considered to be zero. Hence, both assertion and reason are true and the reason is not the correct explanation of assertion.}$ $\text{The assertion states that combustion of all organic compounds is exothermic, which is true because combustion reactions release energy in the form of heat.}$ $\text{The reason states that the enthalpies of all elements in their standard state are zero, which is also true by definition in thermodynamics.}$ $\text{However, the reason does not explain why combustion reactions are exothermic. The exothermic nature of combustion is due to the formation of strong bonds in the products (like CO}_2\text{ and H}_2\text{O) compared to the reactants, resulting in net energy release, not because elemental enthalpies are defined as zero.}$ $\text{Therefore, option 2 is correct.}$

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
}