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1321

Which of the following statements applies during the electrolysis of sodium hydroxide solution using platinum electrodes?

  • A. Na+ ions are discharged at the cathode
  • B. Hydrogen ions are discharged at the cathode
  • C. the concentration of sodium hydroxide decrease at both electrode compartments
  • D. the concentration of sodium hydroxide increases at the cathode only
  • E. the concentration of sodium hydroxide increases at the anode only
View Answer & Discuss (23) JAMB 1979
1322
Which of the following statements is true? When the potassium atom forms its ion
  • A. it gains one electron and becomes neutral
  • B. its atomic number decreases
  • C. it achieves electronic configuration of orgon
  • D. it loses one proton
  • E. it loses one neutron
View Answer & Discuss (10) JAMB 1979
1323
Which of the following contains two amphoteric oxides?
  • A. sodium oxide, Zinc oxide , Magnesium oxide
  • B. Aluminium oxide, Calcium oxide, Zinc oxide
  • C. Potassium oxide, Lithium oxide, Carbon monoxide
  • D. Silver oxide, Lead oxide, Sodium oxide
  • E. Sulphur dioxide, Aluminium oxide, Carbon monoxide
View Answer & Discuss (11) JAMB 1979
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1324
Helium atoms are chemically unreactive because
  • A. there are no electrons around the nucleus
  • B. the number of protons equals the number of electrons
  • C. there are equal number of protons and neutrons in the nucleus
  • D. the outer electron shell is completely filled
  • E. the atoms contain only protons
View Answer & Discuss (5) JAMB 1979
1325

\(50cm^{3}\) of hydrogen are sparked with \(20cm^{3}\) of oxygen at \(100°C\) and \(1atm\) . The total volume of the residual gases in

  • A. 50 cm3
  • B. 10 cm3
  • C. 40 cm3
  • D. 30 cm3
  • E. 70 cm3
View Answer & Discuss (14) JAMB 1979
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