Import Question JSON

Current Question (ID: 18257)

Question:

$\text{A device that converts the energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as:}$

Options:

1. $\text{Fuel cell.}$
2. $\text{Electrolytic cell.}$
3. $\text{Dynamo.}$
4. $\text{Ni-Cd cell.}$

Solution:

$\text{HINT: Fuel cell}$ $\text{Explanation:}$ $\text{A fuel cell converts energy of combustion of fuels like hydrogen and methane directly into electrical energy.}$ $\text{Electrolytic cell converts electrical energy into chemical energy.}$ $\text{Dynamo is an electrical generator which produces direct current with the help of a commutator.}$ $\text{Ni-Cd cell is a type of rechargeable battery which consists of a cadmium anode and a metal grid containing NiO}_2 \text{ acting as a cathode.}$

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
}