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Chemistry 2019 JAMB Past Questions

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31

At 27°C, 58.5g of sodium chloride is present in 250cm\(^3\) of a solution. The solubility of sodium chloride at this temperature is?
(molar mass of sodium chloride = 111.0gmol\(^{-1}\))

  • A. 2.0 moldm\(^{-3}\)
  • B. 0.25 moldm\(^{-3}\)
  • C. 1.0 moldm\(^{-3}\)
  • D. 0.5 moldm\(^{-3}\)
View Answer & Discuss JAMB 2019
32

Which of the following properties increases from left to right along the period but decreases down the group in the Periodic Table?
i. Atomic Number   ii. Ionization energy  iii. Metallic character  iv. Electron affinity

  • A. ii and iii only
  • B. ii and iv only
  • C. iii and iv only
  • D. i and ii only
View Answer & Discuss JAMB 2019
33

The molecular shape and bond angle of water are respectively

  • A. linear, 180°
  • B. bent, 109.5°
  • C. tetrahedral, 109.5°
  • D. bent, 105°
View Answer & Discuss (2) JAMB 2019
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34

Na\(_2\)CO\(_3\) + 2HCl \(\to\) 2NaCl + H\(_2\)O + CO\(_2\)

The indicator most suitable for this reaction should have a pH equal to

  • A. 5
  • B. 7
  • C. 3
  • D. 9
View Answer & Discuss (8) JAMB 2019
35

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

  • A. 75,000 particles
  • B. 35,000 particles
  • C. 25,000 particles
  • D. 50,000 particles
View Answer & Discuss (6) JAMB 2019
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