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Chemistry 2021 JAMB Past Questions

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16

Which of the following is a form of calcium carbonate?

I. limestone
II. marble
III. chalk
Iv. egg-shells

  • A. I only
  • B. I, II and IV
  • C. I and II only
  • D. I, II, III, and IV
View Answer & Discuss (2) JAMB 2021
17

Soaps clean surfaces on the principle based on?

  • A. viscosity
  • B. floatation
  • C. elasticity
  • D. surface tension
View Answer & Discuss (4) JAMB 2021
18

The reactivity of fluorine is due to?

  • A. its high electro negativity
  • B. small size of fluorine atom
  • C. availability of D-orbitals
  • D. strong f-f bond
View Answer & Discuss (2) JAMB 2021
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19

The mass number of a nucleus is?

  • A. Always less than its atomic number
  • B. The sum of the number of protons and neutrons present in the nucleus
  • C. Always more than the atomic weight
  • D. A fraction
View Answer & Discuss (4) JAMB 2021
20

The mass of one Avogadro number of helium atoms is?

  • A. 1.00gram
  • B. 4.00gram
  • C. 8.00gram
  • D. 6.00gram
View Answer & Discuss (4) JAMB 2021
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