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Chemistry Past Questions

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3701

Which of the following does not support the fact that air is a mixture?

  • A. the constituents of air are in a fixed proportion by mass
  • B. it cannot be represented with a chemical formula
  • C. the constituents of air can be separated by physical by physical means
  • D. none of the above
View Answer & Discuss (18) JAMB 2019
3702

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

  • A. Fractional crystallization
  • B. Fractional distillation
  • C. Filtration
  • D. Evaporation
View Answer & Discuss (3) JAMB 2019
3703

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
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3704

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
3705

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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