Import Question JSON

Current Question (ID: 8420)

Question:

$\text{Given below are two statements:}$ $\text{Assertion (A): In the dissociation of PCl}_5 \text{ at constant pressure and temperature, the addition of helium at equilibrium increases the dissociation of PCl}_5.$ $\text{Reason (R): Helium reacts with Cl}_2.$

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:

$\text{Hint: At constant pressure, volume changes and concentration of reactant and product changes.}$ $\text{The reaction is as follows:}$ $\text{PCl}_5 \rightarrow \text{PCl}_3 + \text{Cl}_2$ $\text{At constant pressure, when helium is added to the equilibrium, volume increases. Thus in order to maintain the K constant, degree of dissociation of PCl}_5 \text{ increases. Helium is unreactive towards chlorine gas.}$ $\text{Hence, Assertion is true but the reason is false.}$

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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
}