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Chemistry Past Questions

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3246

An aqueous solution of a metal salt, M. gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia Therefore the cation in M is

  • A. Zn
  • B. Ca
  • C. Al
  • D. Pb
View Answer & Discuss (5) JAMB 2018
3247

What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]

  • A. 0.40 moldm\(^{-3}\)
  • B. 0.50 moldm\(^{-3}\)
  • C. 0.05 moldm\(^{-3}\)
  • D. 0.30 moldm\(^{-3}\)
View Answer & Discuss (9) JAMB 2018
3248

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 \(^{23}\)mol]

  • A. 1.20 x 10\(^{22}\)
  • B. 2.4 x 10\(^{22}\)
  • C. 1.51 x 10\(^{23}\)
  • D. 3.02 x 10\(^{22}\)
View Answer & Discuss (14) JAMB 2018
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3249

The radio isotope used in industrial radiography for the rapid checking of faults in welds and casting is?

  • A. carbon-14
  • B. phosphorus-32
  • C. cobalt-60
  • D. iodine-131
View Answer & Discuss (2) JAMB 2018
3250

Beryllium and Aluminium have similar properties because they

  • A. are both metals
  • B. belong to the same group
  • C. belong to the same period
  • D. are positioned diagonally to each other
View Answer & Discuss (31) JAMB 2018
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