Chemistry 2022 Past Questions | JAMB

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Study the following Economics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

16.  Zn + 2HCL → ZnCl2 + H2

    • A. oxidized
    • B. a reactant
    • C. reduced
    • D. a metal

17.  An organic functional group which can likely decolorize ammoniacal silver nitrate is?

  • A. alkene
  • B. alkane
  • C. alkyne
  • D. alkanol

18.  A colored gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?

  • A. hydrogen sulphide
  • B. carbon(ii)oxide
  • C. chlorine
  • D. sulphur(iv)oxide

19. In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?

  • A. the anode is a silver rod and the cathode is the spoon
  • B. the anode is the spoon and the cathode is a silver rod
  • C. the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
  • D. the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon

20. An organic compound which decolorizes bromine water is likely to be?

  • A. C3H8
  • B. C2H6
  • C. C4H10
  • D. C2H4

 

21. Crude petroleum is converted to useful products by the processes of?

  • A. fractional crystallization
  • B. fractional distillation
  • C. filtration
  • D. chromatography

22. An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

  • A. C44H12O
  • B. C33H9O
  • C. C4H9O
  • D. C3H8O

 

23.  2H2 + O2 → 2H2O

From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm3 of hydroden and 75cm3 of oxygen are involved

  • A. 85cm3
  • B. 50cm3
  • C. 125cm3
  • D. 55cm3

 

25. In which of the following will hydrogen form ionic compound?

  • A. HCL
  • B. NaH
  • C. NH3
  • D. CH4

 

25.  If the volume of a given mass of a gas at 0ºc in 29.5cm3 what will be the volume of the gas at 15ºc, the pressure remaining constant

  • A. 31.6
  • B. 62.2
  • C. 32.7
  • D. 31.1

 

26.  The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?

  • A. CH3CH2COOH + KOH → CH3CH2COOK + H2O
  • B. NH4OH + HCL → NH4 + H2O
  • C. NaOH + HCL → NaCL + H2O
  • D. CH3COOH + NaOH → CH3COONa + H2O

  

27. The pollutant usually presents in a city which generates its electricity from coal?

  • A. fog
  • B. carbon(ii)oxide
  • C. smog
  • D. sulphur(iv)oxide

 

28.  The dehydration of CH3CH2CH2CH2OH will give?

  • A. HC≡CCH2CH3
  • B. CH2≡CH2CH3
  • C. CH3C≡CCH3
  • D. CH3CH≡CHCH3

 

29. Calculate the value of ΔS if the heat change in the in system is 400j at -273ºC

  • A. 40J/K
  • B. 400J/K
  • C. 4J/K
  • D. 0.4J/K

 

30. Which of the following best represent solid gas mixture?

  • A. milk
  • B. kerosene
  • C. soil
  • D. smoke

 

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