Chemistry 2020 Past Questions | JAMB

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

16. How many valence electrons are contained in the element 3115P?

  • A. 3
  • B. 4
  • C. 15
  • D. 31

17. The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO3 is treated with 0.2dm3 of 1 Mole of HCL in the equation

CaCO3 + 2HCL ⇒  CaCl2  + H2O + CO2  , is ?

  • A. 1.00 X 1023
  • B. 6.02 X 1023
  • C. 6.02 X 1022

D. 6.02 X 1024

18.  The volume occupied by 1.58g of a gas at S.T.P is 500cm3. What is the relative molecular mass of the gas?  [ G.M.V at S.T.P = 22.4dm3 ]

  • A. 28
  • B. 32
  • C. 44
  • D. 71

19. Which of the following gases will rekindle a brightly splint?

  • B. NO2
  • B. NO
  • C. N2O
  • D. CL2

20. The shape of ammonia molecule is?

  • A. Trigonal planar
  • B. Octahedral
  • C. Square planar
  • D. Tetrahedral

21. A few drop of conc HCL are added to about 10cm3 of a solution of PH 3.4. The PH of the resulting mixture is?

  • A. less than 3.4
  • B. greater than 3.4
  • C. unaltered
  • D. the same as that of the pure water

22. Chromatography is used to separate components of mixture which differ in their rates of?

  • A. diffusion
  • B. migration
  • C. reaction
  • D. sedimentation

23. Deliquescent substances are also?

  • A. efflorescent
  • B. anhydrous
  • C. hygroscopic
  • D. insoluble

24. Helium is used in observation of ballons because it is?

  • A. Light and combustible
  • B. light and non-combustible
  • C. heavy and combustible
  • D. heavy and non-combustible

25. A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?

[ M = 27, Cl = 35.5]

  • A. MCl
  • B. MCl2
  • C. MCl3
  • D. M2Cl6

26. 32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm3 of water generated 13.0kj of heat. The heat solution is?

  • A. 26.0kj/mol
  • B. 65.0kj/mol
  • C. 130.0kj/mol
  • D. 260.0kj/mol

27. What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?

  • A. 24,125 C
  • B. 48,250 C
  • C. 72,375 C
  • D. 96,500 C

28. Which of the following types of bonding does not involve the formation of new substances?

  • A. Metallic
  • B. Covalent
  • C. Co-ordinate
  • D. Electrovalent

29. Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas? 

  • A. P
  • B. Q
  • C. R
  • D. S

30. The substance often used for vulcanization of rubber is?

  • A. Chlorine
  • B. Hydrogen peroxide
  • C. Sulphur
  • D. Tetraoxosulphate(vi) acid

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