30 Possible/Likely Chemistry 2018 JAMB Questions

30 Possible/Likely Chemistry 2018 JAMB Questions

1. In a chemical reaction, the change in the

concentration of a reactant with time is

a. rate of reaction

b. order of reaction

c. enthalpy of reaction

d. entropy reaction



2. 200cm3 of a gas at 250oC exerts a pressure of

700 mmHg. Calculate its pressure if its volume

increases to 350cm3 at 75oC.

a. 467.11 mmHg

b. 400.00 mmHg

c. 1430.54 mmHg

d. 342.53 mmHg



3. Ethyne is passed through a hot tube containing

organo-nickel catalyst to produce

a. ethanol

b. benzene

c. polythene

d. isoprene



4. Beryllium and aluminium have similar properties

because they

a. belong to the same period

b. are positioned diagonally to each other

c. belong to the same group

d. are both metals



5. The Mathematical expression of Ph is

a. log10 H3O+

b. log10 1/0H-

c. log10 1/H3O+

d. log10 0H-



6. On exposure to the atmosphere, a hydrated salt

loses its water of crystallization to become

anhydrous. This phenomenom is reffered to as:

a. hygroscopy

b. hydrolysis

c. deliquescence

d. efflorescence



7. The nitrogen obtained from air has a density

higher than the one from nitrogen-containing

compounds because the one from air is

contaminated with?

a. rare gas

b. carbon [iv] oxide

c. oxygen

d. water vapour



8. Zn[s] + CUSO4[aq] ——–> ZnSO4[aq] + Cu[s]

a. +1 to +2

b. +1 to + ±3

c. 0 to +2

d. 0 to + 4



9. The process of converting starch to ethanol is

a. cracking

b. fermentation

c. oxidation

d. distillation



10. In the electrolytic extraction of calcium chloride,

the cathode is

a. zinc

b. platinum

c. iron

d. graphite



11. Due to the unstable nature of ethyne, it is stored

by dissolving

a. ethane-1,2-diol

b. ethanoic acid

c. propanone

d. propanol



12. Which subject are you doing?

a. C.R.S

b. Physics

c. English

d. Chemistry



13. The petroleum fraction that is used in heating

furnaces in industries is

a. diesel oil

b. kerosene

c. lubricating oil

d. gasoline



14. In the extraction of sodium from fused sodium

chloride, the anode is made of platinum because?

a. sodium is formed at the anode

b. sodium does not react with platinum

c. chlorine does not react with platinum

d. chlorine is formed at the anode.



15. A Mixture is different from a compound base

because?

a. The properties of a compound are those of its

individual constituents while those of a mixture differ

from its constituents

b. the constituents of a compound are chemically

bound together while those of a mixture are not.

c. a mixture can be represented by a chemical

formula while a compound cannot

d. a mixture is always homogenous while a

compound is not



16. The basicity of CH3COOH is

a. 4

b. 2

c. 3

d. 1



17. The color of litmus in a neutral medium is

a. purple

b. yellow

c. orange

d. pink



18. How Many protons, neutrons and electrons

repectively are present in the element Co?

a. 27, 33 and 33

b. 27, 33 and 27

c. 60, 33 and 60

d. 33, 27 and 27



19. How many faraday of electricity is required to

produce 0.25 mole of copper?

a. 1.00F

b. 0.05F

c. 0.50F

d. 0.01F



20. What is the percentage of sulphur in sulphur [iv]

oxide?

a. 50%

b. 25%

c. 66%

d. 40%



21. Which of the following salts will turn blue litmus

red?

a. Soduim tetrahydroxozincate[ii]

b. sodium trioxocarbonate[iv]

c. zinc chloride hydroxide

d. potassium hydrogentetraoxosulphate[iv]



22. The dispersion of a liquid in a liquid medium will

give

a. an emulsion

b. a gel

c. an aerosol

d. a fog



23. Which of the following will liberate hydrogen from

dilute tetraoxosulphate[iv] acid?

a. lead

b. copper

c. gold

d. magnesium



24. A gas X diffuses twice as fast as gas Y. If the

relative molecular mass of X is 32, Calculate the

relative molecular mass of Y.

a. 128

b. 16

c. 64

d. 8



25. Polystrene is widely used as packaging materials

for fragile objects during transportation because of

its

a. lightness

b. high density

c. high compressibility

d. low density



26. Glycerol or Propane- 1,2,3- triol is obtained from

production of soap.

a. propanol

b. glycerol

c. methanol

d. ethanol



27. Flourine does not occur in the state in nature

because of its high reactivity

a. it is inert

b. it is a poisonous gas

c. of its high reactivity

d. it belongs to the halogen family



28. The polymer used in making car rear lights is

a. polystyrene

b. Perspex

c. polyacrylonitrile

d. Bakelite



29. A Compound that gives a brick-red colour to a

non luminous flame is likely to contain

a. Calcuim ions

b. copper ions

c. aluminium ions

d. sodium ions



30. If the the difference in electronegativity of

elements P and Q is 3.0. The bond that will be

formed within them is

a. Co-ordinate

b. Metallic

c. Ionic

d. Covalent



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