Chemistry Questions Answers

• 15. What nucleus of atom contains ?

  1. protons
  2. electrons
  3. electrons and protons
  4. protons and neutrons

  Answer And Explanation

  Answer: Option D

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• 16. The isotope atoms differ in ?

  1. number of neutrons
  2. atomic number
  3. number of electrons
  4. atomic weight

  Answer And Explanation

  Answer: Option A

  Explanation:

  Important to note that isotope atoms have same atomic number.

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• 17. Human bone does not contain

  1. calcium
  2. carbon
  3. oxygen
  4. phosphorous

  Answer And Explanation

  Answer: Option C

  Explanation:

  Human bone contains calcium, carbon, phosphorous.

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• 18. Homo nuclear molecules contain ?

  1. polar bond
  2. covalent bond
  3. ionic bond
  4. coordinate bond

  Answer And Explanation

  Answer: Option B

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• 19. Air contains maximum amount of
  

  1. oxygen
  2. nitrogen
  3. hydrogen
  4. carbon dioxide

  Answer And Explanation

  Answer: Option B

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• 20. Washing soda is ?

  1. sodium sulphite
  2. sodium bicarbonate
  3. sodiun carbonate
  4. sodium biosulphite

  Answer And Explanation

  Answer: Option C

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• 21. Natural rubber is a polymer derived from ?

  1. ethylene
  2. propylene
  3. isoprene
  4. butadiene

  Answer And Explanation

  Answer: Option C

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