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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