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Chemistry JAMB Past Questions

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1066
When a pressure cooker is half filled with water, and heated to boiling point, then the pressure inside the cooker will?
  • A. decrease, since only a fraction of the water molecules has changed to vapour
  • B. remain constant, because the total number of water molecules has not changed
  • C. increase, because the water molecules can now reach every part of the sealed tube
  • D. decrease, since water boils under reduced pressure
  • E. increase, because the water vapour molecules now strike the walls of the tube more frequently because of their increased velocity
View Answer & Discuss (2) JAMB 1982
1067

An element X has two isotopes, \(^{20} _{10}X\) and \(^{22} _{10}X\),
present in the ratio 1:3. The relative atomic mass of X would be?

  • A. 20.5
  • B. 21.0
  • C. 21.5
  • D. 22.0
  • E. 22.5
View Answer & Discuss (41) JAMB 1982
1068
Which of the following is a neutralization reaction? Addition of
  • A. nitric acid to hydrochloric acid
  • B. nitric acid to sulphuric acid
  • C. nitric acid to distilled water
  • D. nitric acid to sodium hydroxide
  • E. sodium chloride to distilled water
View Answer & Discuss (4) JAMB 1982
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1069

A current of 10.0A was passed for 1 hour through a solution of copper (ll) sulphate between the copper electrodes. Which of the following observation would be correct?
(1 Faraday = 96,500 coulombs) (i) 0.186 mole of copper is dissolved from the anode. (ii) 0.372 mole of copper is deposited on the cathode. (iii) the original Cu2+ ion concentration of the solution remains unchanged. (iv) the original Cu2+ ion concentration of the solution decreases.

  • A. i and ii
  • B. i and iii
  • C. i and iv
  • D. ii and iii
  • E. ii and iv
View Answer & Discuss (14) JAMB 1982
1070
In the preparation of carbon monoxide by heating ethanedioic acid with concentrated sulphuric acid, the concentrated sulphuric acid act as?
  • A. an oxidizing agent
  • B. a reducing agent
  • C. a dehydrating agent
  • D. a reaction medium
  • E. a catalyst
View Answer & Discuss (2) JAMB 1982
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