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Chemistry Past Questions

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3321

The preferential discharge of ions during electrolysis is influenced by the 

  • A. mechanism of electrolysis
  • B. electrolytic reactions
  • C. nature of the electrode
  • D. type of electrolytic cell
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3322

The valence electrons of \(_{12}Mg\) are in the

  • A. 3s orbital
  • B. 2p\(_{x}\)
  • C. 2s orbital
  • D. 1s orbital
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3323

Stainless steel is an alloy comprising of

  • A. Fe and C
  • B. Fe and Ni
  • C. Fe, C and Ni
  • D. Fe, C and Al
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3324

The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is   \([N_{A} = 6.02 \times 10^{23}]\)

  • A. \(1.2 \times 10^{22}\)
  • B. \(1.2 \times 10^{23}\)
  • C. \(2.4 \times 10^{22}\)
  • D. \(2.4 \times 10^{23}\)
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3325

The most suitable substance for putting out petrol fire is

  • A. water
  • B. carbon(IV) oxide
  • C. fire blanket
  • D. sand
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