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Current Question (ID: 9113)

Question:

$\text{The incorrect statement among the following regarding alkaline earth metals is :}$

Options:

1. $\text{Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals.}$
2. $\text{Only Ca, Sr, Mg, and Ba give a flame test.}$
3. $\text{Alkaline earth metals have high electrical, and thermal conductivities.}$
4. $\text{All alkaline earth metals react with halogen and form metal halides, with the general formula } \text{MX}_2\text{.}$

Solution:

$\text{HINT: Mg and Be do not give a flame test.}$ $\text{Explanation:}$ $\text{Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals is a correct statement.}$ $\text{Alkaline earth metals have high electrical and thermal conductivities is a correct statement.}$ $\text{All alkaline earth metals react with halogen and form metal halides, with general formula } \text{MX}_2\text{. It is a correct statement.}$ $\text{The second statement is the wrong statement because Mg and Be didn't give a flame test. The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not impart any color to the flame.}$

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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
}