Import Question JSON

Current Question (ID: 7654)

Question:

$\text{The correct sequence of increasing order of density is:}$

Options:

1. $\text{Li} < \text{K} < \text{Na} < \text{Rb} < \text{Cs}$ (Correct)
2. $\text{Li} < \text{Na} < \text{K} < \text{Rb} < \text{Cs}$
3. $\text{Cs} < \text{Rb} < \text{K} < \text{Na} < \text{Li}$
4. $\text{K} < \text{Li} < \text{Na} < \text{Rb} < \text{Cs}$

Solution:

$\text{HINT: K is less dense than Na.}$ $\text{Explanation:}$ $\text{Generally first group elements density increases down the group but with one exception, that is, K density is less than Na. Here it is difficult to develop a simple explanation for this trend because density depends on two factors, that is atomic mass and atomic volume both of which change down the group. The comparatively change in atomic mass/atomic volume for K is less than Na. Thus, K density is less than Na.}$ $\text{Hence, density order is as follows:}$ $\text{Li} < \text{K} < \text{Na} < \text{Rb} < \text{Cs}$

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
}