Chemistry 2015 (Jamb)

1. When a few drops of barium chloride is added to an unknown sample acidified with hydrochloric acid, a white precipitate insoluble in excess of the acid was obtained. The likely anion in the sample is


2. In a chemical reaction, when the energy of the colliding reactant particles is less than the activation energy, the reaction will


3. A gas that forms a black precipitate with lead(II)ethanoate is


4. H2S(g) + Br2(g) → 2HBr(g) + S(s)
In the reaction above, the oxidizing agent is


5. Oxygen in air can be removed using


6. Which of the following halogens is the most reactive?


7. The type of salt that ionizes to reduce three different ions in solution is



A property common to the structure above is that they have the same
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9. Diamond is used in making jewelry due to its


10. PCl5(l) PCl3(l) + Cl2(g) ΔH = +ve
In the reaction above, the forward reaction is favoured by


11. The monomer of natural rubber is


12. Calculate the pH of a solution of 0.0001moldm-3 hydrochloric acid


13. The process whereby a gaseous body loses some of its kinetic energy to a colder body is referred to as


14. Which of the following dry agents is NOT suitable for drying hydrogen sulphide?


15. The presence of impurities in a solid will make the melting point to


16. The discovery that protons and neutrons are concentrated at the nucleus of an atom was postulated by


17. The monomer of natural rubber is


18. Which of the following is hydroscopic substance?


19. The common ore of iron is


20. Pollution of water by crude oil can lead to


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