CHM 104 MOCK EXAMINATION
CHM 104 MOCK EXAMINATION
Total Questions: 100
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1. If a solution has a pH of 5.5 at 25°C, what is its [OH–] ?
3.2 × 10–9 M
2. Calculate the dissociation constant for nitrous oxide (kb = 2.0 × 10–11)
5.0 × 10–4
3. Calculate [OH–] in 0.720 g of Ba(OH)2 in 250 mL of solution
0.034
4. The relationship between pH, pKa and log (salt / acid) is known as...
Henderson–Hasselbalch equation
5. Arrhenius defined acids as substances which dissociate in water to give
H+ ions
6. What is the pOH of 0.004 M HNO3 ?
11.6
7. _ substances are molecules or ions that can behave as Brønsted–Lowry acid and base
Amphiprotic
8. Solutions that can conduct electric current are known as...
Electrolyte
9. What is the pH of 0.2 M H2SO4 solution
0.4
10. The acid found in Lime and Lemon is...
Citric acid
11. Which of the following compounds can not be a Brønsted–Lowry base?
NH4+
12. The pH of 0.20 M NaOH solution is...
13.3
13. The activity of any pure substance in its standard state tends to...
1
14. _ causes sour taste in milk
Lactic acid
15. A solution which maintains its pH fairly constant even upon the addition of small amount of acid or base is...
A buffer solution
16. Which of the following is a Monoprotic acid?
CH3COOH
17. Pb(OH)NO3 is a _ salt?
Basic salt
18. A buffer solution contains 0.5 M NH3 and 0.8 M NH4Cl. Calculate the pH of the solution (kb for NH3 = 1.8 × 10–5)
9.06
19. Rate of radioactive decay is a _ order kinetic process
First
20. After 32 days, 5 mg of an 80 mg sample of a radioisotope remains unchanged. What is the half life (in days) of this radioisotope?
8 days
21. The process in which a nucleus breaks down by emitting radiation is known as...
Radioactive decay
22. Atoms of one element are converted to atoms of another element through...
Transmutation
23. Which nuclear decay emission consists of energy only?
Gamma radiation
24. One Ci is equal to how many disintegrations/s?
3.7 × 1010
25. Calculate the energy released when 0.005 g of mass is lost in a nuclear reactor (c = 3.0 × 108 m/s)
4.5 × 1011 J
26. _ is defined as the energy required to separate a nucleus into individual nucleons
Binding energy
27. One of the following is not an application of radioisotopes
Measuring engine capacity
28. Astatine– 216 atoms undergo an alpha emission, a beta emission, and another alpha emission before they reach a stable nuclide. What is the mass number of the final product?
208
29. Choose one statement that is true about beta radiation.
It has a relatively small mass
30. The half life of 112Ag is 4.5 hours. How long will it take for 60% of a sample to disappear?
5.95 hours
31. 238U has a half life of 5.3 × 107 years. What is the rate constant for the process of the decay?
1.308 × 10–8 year–1
32. The half life of 14N is 10.1 mins. Starting with 1000 atoms, how many atoms will remain after 1 hour?
16 atoms
33. When an element undergoes radioactive decay, it is said to undergo...
Nuclear transformation
34. Calculate the half life for an element that has a decay rate constant of 1.24 × 10–4 year–1
5589 years
35. Which of these particles has the most ionising potential?
Alpha particle
36. The dissolution of alkali metal in water gives
Alkaline solution
37. Which of the following is not an s block element?
Germanium
38. In the extraction of iron, Limestone is added along with ore and coke. What is the function of the limestone?
To remove impurities
39. Calculate the neutron to proton ratio of Carbon 14
1.33
40. One of these is an example of sp2 hybridization?
BF3
41. BF3 exhibit _ shape
Trigonal planar
42. Elemental analysis of a chloride of Phosphorus gave 23.4% 31P and 79.6% of 35.5Cl. By determining the molecular formulae of this compound, suggest the type of hybridization and shape of the molecule (note EF = MF)
sp3, trigonal pyramidal
43. What type of hybridization is in SF6?
sp3d2
44. One of the following is not true about group IV elements on descending the group.
The ability to catenate increases
45. Graphite is exploited commercially for the following reasons except
Hardness
46. Which of the following is false of group 1A
They are generally unreactive
47. The dissolution of alkali metals lead to evolution of...
Hydrogen gas
48. Which of the following member of group 4 is poisonous?
Pb
49. The anode in Down's cell is made of _
Graphite
50. Group 2 elements are called...
Alkaline earth metals
51. Which of the following is used for making gun powder?
KNO3
52. Which of these rays has the most ionizing effect?
α–rays
53. The presence of unpaired electron(s) is _
Paramagnetic property
54. How many d electrons can be found in Sc3+
0
55. If a proton changes into a neutron, a(n) _ is emitted
Positron
56. Which of the following is a metalloid?
Germanium
57. Which of the following method(s) can be used to purify metals like gold from their ores
Panning
58. Which of the following group 1 elements can form nitride with Nitrogen?
Li
59. _ is the hardest known allotrope of carbon?
Diamond
60. _ is the number of donor groups of ligand that are coordinated
Denticity
61. _ is used in atomic clock
Cs
62. Melting point _ down a group
Decrease
63. Gamma ray is not deflected in a magnetic field because it is _
Neutral
64. _ is an ore of aluminium
Bauxite
65. An element with the electronic configuration [Ne] 3s2 3p4 belongs to _ group and _ block in the periodic table
VI and p
66. The structure and hybridization of H2O is _
Bent, sp3
67. Which of the following is a radioactive element?
Ra
68. Nucleons are _
Protons + neutrons
69. _ is the most abundant element in group IV
Silicon
70. Li element exhibit high covalent character as against the ionic character of group 1A elements due to...
Its very high charge density
71. Formation of M2+ is difficult in group 1A because of...
High second ionisation energy
72. Oxides of alkali metals are different from alkali metals in that they...
Have a duller appearance
73. One of the following statements is not true about the d block elements
Their arrangement corresponds to the filling of s orbitals in these atoms
74. Nuclear reactor uses...
Fission reactions
75. One of the following is not a property of SnH4 and PbH4
They form volatile liquids at room temperature
76. The structure of diamond is...
A three dimensional array of carbon atoms, each atom surrounded tetrahedrally by four other carbons
77. Group IV elements exhibit inert pair effect which is when...
The two electrons in the p orbital are removed, the remainder in the s orbital are held more strongly by the increased positive charge
78. Which of the following pair crystallize with the same structure as diamond ?
Si and Ge
79. A temperature controlled oxidation of sodium metal at 180°C produces what type of sodium oxide?
Na2O2
80. Metals in group IIA react with oxygen to form oxides at room temperature except...
Be
81. Which of the following metals can form nitrides with Nitrogen?
Li
82. Which of the following is not a correct property of Transition metals?
They possess only one oxidation state
83. Pyrex is a type of _ glass
Borosilicate
84. Electrolytic reduction method for metal extraction gives pure product. In which electrode compartment does reduction occur?
Cathode
85. Give reason why titanium can not be extracted by reducing the ore using Carbon as a cheap reducing agent
Titanium forms carbide if it is heated with Carbon
86. A Carbon–Carbon triple bond consists of:
One sigma bond and two pi bonds
87. There are three types of carbides, _, _ and _
Covalent, Interstitial, and salt-like
88. Carbon dioxide gas (CO2) is detected by its action on Lime water and Baryta water which are represented as _ and _
Ca(OH)2 and Ba(OH)2
89. One of these cannot be used to detect radiation
Weber's meter
90. Carbon monoxide is a poisonous gas, sparingly soluble in water and formed by one of the following equations
HCOOH + H2SO4 → CO + H2O
91. The alkaline earth elements burn in nitrogen and form nitrides as...
M3N2
92. Lithium Aluminium hydride is...
A strong reducing agent
93. The apparatus used in measuring the pH of a given solution is...
pH meter
94. When ore is churned up in oil and water to separate it from impurities, it forms a _
Froth
95. The best method to extract the alkali and alkaline earth metals is by...
Electrolysis
96. Which of these statements is true?
Ionisation energy increases across the period
97. A triple bond involves sharing _ electrons
6
98. These transition metals exhibit variable oxidation states except?
Zinc
99. Predict the shape of PCl5 according to VSEPR
Trigonal bipyramidal
100. The right order for the conductivity measurements is _ in aqueous solution
Cs+ > Rb+ > K+ > Na+ > Li+
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