Chemistry 2018 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.

31. How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10^23

  • A. 1.20 x 10^22
  • B. 2.4 x 10^22
  • C. 1.51 x 10^22
  • D. 1.51 x 10^22

32. The radio isotope used in industrial radiography for the rapid checking of faults in welds and casting is?

  • A. Carbon-14
  • B. Phosphorus-32
  • C. Cobalt
  • D. Iodine-131

33. Beryllium and Aluminium have similar properties because they

  • A. Are both metal
  • B. Belong to the same group
  • C. Belong to the same period
  • D. Are positioned diagonally to each other

34.  mE + nF —–> pG + qH

  • A[E]m[F]/[G]p[H]q
  • B. [E][F]/[G][H]
  • C. [G]p[H]p/[E]m[F]
  • D. [G][H]/[E][F]

35. 

(I). 3CuO(s) + 2NH3(g) —–> 3Cu(s) + 3H2O(l) + N2(g) 

(II). 2NH3(g) + 3Cl2(g) —–> 6HCl(g) + N2(g) 

(III). 4NH3(g) + 3O2(g) —–> 6H2O(l) + N2(g) 

The reactions represented by the equations above demonstrate the

  • A.  Basic properties of ammonia
  • B.  Acidic properties of ammonia
  • C. Reducing properties of ammonia
  • D. Oxidizing properties of ammonia

36.The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is

  • A. Na2SO4
  • B.  Na2SO3
  • C. Na2S 
  •  D. Na2CO4

37.  The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

  • A. carbon(IV)oxide
  • B. carbon(II)oxide
  • C. Soda
  • D. Glucose

38. Which of the following are mixtures? 

I. Petroleum 

II. Rubber latex 

III. Vulcanizer’s solution 

IV. Carbon sulphide

  • A.  I, II and III
  • B.  I, II and IV
  • C.  I and II only
  • D. I and IV only

39. A balanced chemical equation obeys the law of

  • A. Conservation of mass
  • B. Definite  proportion
  • C. multiple proportions
  • D.
  • Conservation of energy

40. When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;

  • A. Nitrogen and carbondioxide
  • B. Rare gases
  • C. Nitrogen and oxygen
  • D. Nitrogen and the rare gases

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