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Chemistry JAMB Past Questions

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2001

Consider the equation below:

Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O.

The oxidation number of chromium changes from

  • A. +5 to +3
  • B. +6 to +3
  • C. -2 to +3
  • D. +7 to +3
View Answer & Discuss (5) JAMB 2019
2002

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
2003

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
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2004

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
2005

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
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