31. When chlorine is passed through a sample of water, the pH of the water sample would be
- A. < 7
- B. > 7
- C. = 7
- D. 0
32. How many atoms are contained in 0.2moles of nitrogen? \([N_{A} = 6.02 \times 10^{23}]\)
- A. \(1.20 \times 10^{23}\)
- B. \(2.41 \times 10^{23}\)
- C. \(3.62 \times 10^{23}\)
- D. \(4.82 \times 10^{23}\)
33. The strength of metallic bonds depends on the
- A. charge density of the atoms
- B. ductility of the metal
- C. number of valence electrons
- D. total number of electrons in the atom
34. When zinc is added to AgNO\(_{3}\) solution, crystals of silver forms on the zinc surface. This indicates that zinc is
- A. oxidised
- B. reduced
- C. decomposed
- D. dissociated
35. The empirical formula of a compound containing 0.067mol Cu and 0.066mol O is [Cu = 63.5, O = 16]
- A. \(Cu_{2}O\)
- B. \(CuO\)
- C. \(CuO_{2}\)
- D. \(CuO_{4}\)
36. The change in the oxidation state of iron in the reaction represented by the equation: \(2FeCl_{3} + H_{2}S \to 2FeCl_{2} + 2HCl + S\) is
- A. +2 to +3
- B. 0 to +2
- C. +3 to +2
- D. +3 to 0
37. Which of the following methods can be used to seperate blood cells from plasma?
- A. Centrifugation
- B. Filtration
- C. Chromatography
- D. Distillation
38. Which of the following statements is true about ionic radius? Ionic radius
- A. increases as nuclear charge increases
- B. decreases as nuclear charge increases
- C. decreases as nuclear charge decreases
- D. remains constant as nuclear charge increases
39. Analysis of a hydrocarbon shows that it contains 0.93g of Carbon per gram of the compound. The mole ratio of carbon to hydrogen in the compound is [H = 1.0, C=12.0]
- A. 1:1
- B. 1:2
- C. 2:1
- D. 2:3
40. The law of definite proportions states that
- A. pure samples of the same compound contain the same elements combined in the same proportion by mass
- B. pure samples of substances are in the same proportion by mass
- C. chemical compounds are pure because they contain the same elements
- D. matter can neither be created nor destroyed.
