Import Question JSON

Current Question (ID: 10648)

Question:

$\text{The compound among the following with the lowest p}K_a \text{ value is?}$

Options:

1. $\text{H}_2\text{O}$
2. $\text{H}_2\text{S}$
3. $\text{H}_2\text{Se}$
4. $\text{H}_2\text{Te}$ (Correct)

Solution:

$\text{HINT: Down the group acidity increases.}$ $\text{Explanation:}$ $\text{STEP 1: Down the group acidity of Group 16 hydride increases down the group because bond dissociation enthalpy of H-E bond decreases down the group and because of its acidity of hydride increases.}$ $\text{STEP 2:}$ $\text{The p}K_a \text{ values for the molecules are:}$ $\text{H}_2\text{O}: \text{p}K_a = 15.74$ $\text{H}_2\text{S}: \text{p}K_a = 7.40$ $\text{H}_2\text{Se}: \text{p}K_a = 3.89$ $\text{H}_2\text{Te}: \text{p}K_a = 2.60$ $\text{Since lower p}K_a \text{ values indicate stronger acids, H}_2\text{Te has the lowest p}K_a \text{ value and is therefore the strongest acid among the given options.}$

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
}