Import Question JSON

Current Question (ID: 18107)

Question:

$\text{Select the correct option based on statements below:}$ $\text{Assertion (A):}$ \text{When NaCl is added to water a depression in freezing point is observed.}$ $\text{Reason (R):}$ \text{The lowering of vapour pressure of a solution causes depression in the freezing point.}$

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:

$\text{Hint: When a non-volatile solute like NaCl is added to water, then depression in freezing point occur.}$ $\text{When a non-volatile solute like NaCl is added to water, then depression in freezing point occur.}$ $\text{The non-volatile solute decreases the number of water molecules at the surface of a liquid because NaCl molecules that might occupy the surface.}$ $\text{This means that the solution now exerts a lower vapour pressure as compared to that of pure water.}$ $\text{The solution will freeze when its vapour pressure equals the vapour pressure of the pure solvent.}$ $\text{According to Raoult's law, when a non-volatile solid is added to the solvent its vapour pressure decreases and now it would become equal to that of solid solvent at a lower temperature.}$ $\text{Thus, the freezing point of the solvent decreases.}$ $\text{Hence, Assertion and reason both are correct statements and reason is correct explanation for assertion.}$

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
}