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Current Question (ID: 13598)

Question:
Which of the following set of animals belong the phylum hemichordate?
Options:
  • 1. Balanoglossus, Saccoglossus
  • 2. Salpa, Doliolum
  • 3. Petromyzon, Myxine
  • 4. Dentalium, Chaetopleura
Solution:
Balanoglossus and Saccoglossus are both examples of animals that belong to the phylum Hemichordata. Hemichordates are a group of marine animals that are characterized by a variety of features, including a dorsal nerve cord, gill slits, and a stomochord (a structure similar to a notochord). They are considered to be the closest living relatives of echinoderms, such as sea stars and sea urchins. Salpa and Doliolum (option 2) are examples of animals that belong to the phylum Chordata, but not Hemichordata. Chordates are characterized by having a notochord, a dorsal nerve cord, and gill slits at some point during their life cycle. Petromyzon and Myxine (option 3) are examples of animals that belong to the phylum Chordata, specifically the class Petromyzontida, which includes lampreys. Dentalium and Chaetopleura (option 4) are examples of animals that belong to the phylum Mollusca, not Hemichordata. Mollusca is a large phylum of animals that includes snails, clams, and squids, among others.

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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
}