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Inside this Chemistry JAMB past questions and answers PDF are several years of Chemistry JAMB examination past questions and answers including the most recent JAMB examinations because we update it every year. You will be happy to get this and start getting prepared right away. You sure need to pass this exam, and believe me, you will.
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1. X is crystalline salt of sodium. Solution ofX in water turns litmus red produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives a white precipitate which is insoluble in dilute hydrochloric acid. X is
2. The alkanol obtained from the production of soap is
3. The flame used by welders in cotton metals is
A. butane gas flame
B. acetylene flame
C. kerosene flame
D. oxy-acetylene flame
E. oxygen flame
4. Consecutive members of an alkane homologous series
5. If an element has the lectronic configuration 1s2 2s2 2p6 3s2 3p2, it is
A. a metal
B. an alkaline earthmetal
C. an s-block element
D. a p-block element
E. a transition element
6. Some copper (11) sulphate pentahydrate (CuSO45H2O), was heated at 120oC with the following results:Wt of crucible= 10.00 g;Wt ofcrucible +CuSO45H2O=14.98g; Wt of crucible + residue = 13.54g. Howmanymolecules of water of crystallization were lost? [H=1, Cu =63.5, O=16, S= 32]
7. The three-dimensional shape of methane is
Question 8-10 are based on the following
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the element C, H, and O in the atomic ratio 1:2:1. The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a ‘pop’ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
8. Compound W is
A. a soap
B. an oil
C. an alkane
D. an ester
9. Themolecular formula of X is
10. reaction of X with yeast forms the basic of the
A. plastic industry
B. textile industry
C. brewing industry
D. soap industry
E. dyeing industry.
11. A mixture of common salt, ammonium chloride and barium sulphate can best be separated by
A. addition of water followed by filtration then sublimation
B. addition ofwater followed by sublimation then filtration
C. sublimation followed by addition of water then filtration
D. fractional distillation
E. fractional crystallization.
12. Which of the following relationships between the pressure P, the volume V and the temperature T, represents and ideal gas behaviors?
C. PT& V
E. P & V/T
13. In the above experiment (fig1) the litmus paper will initially
A. be bleached
B. turn green
C. turn red
D. turn blue
E. turn black
See also: JAMB Past Questions and Answers for other subjects.