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Current Question (ID: 8117)

Question:

The Lewis dot symbols for atoms of the elements $\text{Mg}$, $\text{Na}$, $\text{O}$, and $\text{N}$, respectively, would be:

Options:

1. $\text{O}$, $\text{N}$, $\text{Mg}$, $\text{Na}$
2. $\text{O}$, $\text{N}$, $\text{Mg}$, $\text{Na}$
3. $\text{Mg}$, $\text{Na}$, $\text{O}$, $\text{N}$
4. $\text{Mg}$, $\text{Na}$, $\text{O}$, $\text{N}$

Solution:

\text{HINT: Valence electrons should be present in Lewis dot structure.} \text{Explanation:} \text{Mg: There are two valence electrons in Mg atom.} \text{Hence, the Lewis dot symbol for Mg is: } \text{Mg} \cdot \cdot \text{Na: There is only one valence electron in an atom of sodium.} \text{Hence, the Lewis dot structure is: } \text{Na} \cdot \text{O: There are six valence electrons in an atom of oxygen.} \text{Hence, the Lewis dot structure is: } \overset{\cdot \cdot}{\underset{\cdot \cdot}{\text{O}}} \cdot \cdot \text{N: There are five valence electrons in an atom of nitrogen.} \text{Hence, the Lewis dot structure is: } \overset{\cdot \cdot}{\underset{\cdot \cdot}{\text{N}}} \cdot \text{Therefore, the correct order is Mg, Na, O, N matching option 3.}

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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
}