Import Question JSON

Current Question (ID: 16932)

Question:

$\text{Given below are two statements:}$ $\text{Statement I:}$ \text{All paramagnetic substances become diamagnetic as their temperature is lowered.}$ $\text{Statement II:}$ \text{All ferromagnetic substances become paramagnetic when their temperature is lowered.}$

Options:

1. $\text{Statement I is incorrect and Statement II is correct.}$
2. $\text{Both Statement I and Statement II are correct.}$
3. $\text{Both Statement I and Statement II are incorrect.}$
4. $\text{Statement I is correct and Statement II is incorrect.}$

Solution:

$\text{Hint: Curie's law is given by, } \chi = \frac{1}{T - T_c}$ $\text{Explanation: Paramagnetic substances have unpaired electrons which result in a net magnetic moment of the atoms.}$ $\text{Diamagnetic substances do not have unpaired electrons and they do not have a net magnetic moment.}$ $\text{If the temperature of a paramagnetic substance is lowered, it cannot result in all the electrons being paired.}$ $\text{So the first statement is incorrect.}$ $\text{Also, the ferromagnetic substances become paramagnetic substances when the temperature is increased.}$ $\text{So, the second statement is also incorrect.}$

Import JSON File

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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
}