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Chemistry 2019 JAMB Past Questions

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41

Which of the following is a physical change?

  • A. Exposing white phosphorus to air
  • B. Burning kerosene
  • C. Dissolving calcium in water
  • D. Freezing ice cream
View Answer & Discuss (2) JAMB 2019
42

In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm\(^3\) of 1.25 molar tetraoxosulphate (vi) acid?

  • A. 25cm\(^3\)
  • B. 10cm\(^3\)
  • C. 20cm\(^3\)
  • D. 50cm\(^3\)
View Answer & Discuss (2) JAMB 2019
43

Sulphur exists in six forms in the solid state. This property is known as

  • A. Isomerism
  • B. Allotropy
  • C. Isotopy
  • D. Isomorphism
View Answer & Discuss (2) JAMB 2019
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44

In the reaction:
M + N → P
ΔH = +Q kJ

Which of the following would increase the concentration of the product?

  • A. Adding a suitable catalyst
  • B. Increasing the concentration of P
  • C. Increasing the temperature
  • D. Decreasing the temperature
View Answer & Discuss JAMB 2019
45

A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180. Find the molecular formula.
[H = 1, C = 12, O = 16]

  • A. C\(_3\)H\(_6\)O\(_3\)
  • B. C\(_6\)H\(_6\)O\(_3\)
  • C. C\(_6\)H\(_{12}\)O\(_6\)
  • D. CH\(_2\)O
View Answer & Discuss (9) JAMB 2019
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