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Current Question (ID: 16934)

Question:

$\text{When cooled below } 4.2 \text{ K, mercury becomes a superconductor, which means it has no electrical resistance. When a current is passed through mercury under these conditions, which one of the following effects will be present?}$ $\text{(a) thermal}$ $\text{(b) chemical}$ $\text{(c) magnetic}$ $\text{Choose the correct option from the given ones:}$

Options:

1. $\text{(a) and (c) only}$
2. $\text{(a), (b) and (c)}$
3. $\text{(b) only}$
4. $\text{(c) only}$

Solution:

$\text{Hint: When a current is passed through a conductor under a superconducting state, a magnetic field is developed.}$ $\text{Explanation: Since there will be no electrical resistance, no thermal energy can be released and there will also be no thermal effect.}$ $\text{Since Mercury is a single element acting as the conductor, there can be no possible chemical effect.}$ $\text{Although, since Mercury is a metal, and there is electricity or current passed through it, there will surely be magnetism.}$

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
}