Chemistry – Chemical Elements

1. How many electrons can be accommodated in the s-orbital?

  1. 2
  2. 4
  3. 8
  4. 10
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Answer: Option A. 2

2. Which is the most chemically active among the following?

  1. Helium
  2. Neon
  3. Fluorine
  4. Argon
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Answer: Option C. Fluorine

3. Which alkali metal ion from the following has the highest hydration enthalpy?

  1. Sodium
  2. Lithium
  3. Potassium
  4. Rubidium
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Answer: Option B. Lithium

4. What is the accurate decreasing order of bio elements present in the human body?

  1. Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus
  2. Carbon, Hydrogen, Oxygen, Nitrogen, Calcium, Phosphorus
  3. Nitrogen, Hydrogen, Carbon, Oxygen, Calcium, Phosphorus
  4. Hydrogen, Oxygen, Nitrogen, Carbon, Calcium, Phosphorus
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Answer: Option A. Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus

5. Which of the following is a Noble Gas?

  1. Oxygen
  2. Hydrogen
  3. Nitrogen
  4. Argon
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Answer: Option D. Argon