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16

A hydrocarbon containing 88.9% carbon has the empirical formula [H = 1 C = 12]

  • A. CH
  • B. CH2
  • C. C2H3
  • D. C2H5
View Answer & Discuss (33) WAEC 2008
17

The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?

  • A. colourless
  • B. orange
  • C. pink
  • D. yellow
View Answer & Discuss (9) WAEC 2011
18

Which of the following electron configurations represents that of an atom in its ground state?

  • A. 1s 22s12p1
  • B. 1s22s22p63s13p1
  • C. 1s22s12p3
  • D. 1s22s22p63s0
View Answer & Discuss (5) WAEC 2012
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19

An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?

  • A. 1718W
  • B. 1817W
  • C. 3517W
  • D. 3518W
View Answer & Discuss (3) WAEC 2014
20

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?

  • A. XY
  • B. X2Y
  • C. XY2
  • D. X3Y2
  • E. X2Y3
View Answer & Discuss (7) NECO 2001
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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