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996
For iron to rust, there should be present?
  • A. oxygen
  • B. moisture
  • C. carbondioxide
  • D. oxygen and moisture
  • E. oxygen, moisture and carbondioxide
View Answer & Discuss (7) JAMB 1981
997
The mass number of an atom is?
  • A. the number of electrons in the atom
  • B. the number of protons in the nucleus of the atom
  • C. the number of neutrons in the nucleus of the atom
  • D. the sum of numbers of electrons and protons inthe atom
  • E. the sum of numbers of proton and neutrons in the nucleus of the atom
View Answer & Discuss (3) JAMB 1981
998

Sodium and potassium belong to the same group of the Periodic Table. This is because?

  • A. both are metals
  • B. both are soft and lighter than water
  • C. both form cations by losing electrons
  • D. both have identical electronic configuration
  • E. both react with water vigorously
View Answer & Discuss (33) JAMB 1981
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999

Oxidation is the process of?

  • A. gain of electrons
  • B. loss of electrons
  • C. gain of hydrogen
  • D. loss of oxygen
  • E. addition of an electropositive element to a substance
View Answer & Discuss (8) JAMB 1981
1000
the number of atoms in one mole of a substance is equal to?
  • A. the atomic number
  • B. the avogadro number
  • C. the gas constant
  • D. the number of neutrons
  • E. the number of electrons
View Answer & Discuss (5) JAMB 1981
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