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Current Question (ID: 12013)

Question:
The cell wall is impregnated with silica to form transparent siliceous shell in
Options:
  • 1. Dinoflagellates
  • 2. Euglenoids
  • 3. Diatoms
  • 4. Slime moulds
Solution:
Diatoms are unicellular algae that belong to the phylum Bacillariophyta. They have a unique cell wall that is made up of two overlapping valves that fit together like a pillbox. These valves are composed of a mixture of organic material and silica, which gives the diatom cell wall a rigid and durable structure. The silica impregnated cell wall is known as a frustule, and it is responsible for the intricate and beautiful patterns seen in diatom micrographs.

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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
}