Import Question JSON

Current Question (ID: 9166)

Question:

$\text{Be and Mg did not give flame colour because:}$

Options:

1. $\text{Energy released by excited electron falls in visible region.}$
2. $\text{Energy released by excited electron does not fall in visible region}$
3. $\text{s-s transition.}$
4. $\text{Charge transfer.}$

Solution:

$\text{Hint: Be and Mg doesnot show electronic transition in visible region}$ $\text{Explanation:}$ $\text{When an alkaline earth metal is heated, the valence electrons get excited to a higher energy level.}$ $\text{When this excited electron comes back to its lower energy level, it radiates energy, which belongs to the visible region. Hence, the colour is observed.}$ $\text{In Be and Mg, the electrons are strongly bound. The energy required to excite these electrons is very high. Therefore, when the electron reverts back to its original position, the energy released does not fall in the visible region.}$ $\text{Hence, no colour in the flame is seen.}$

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
}