1. Hardness of water is due to the presence of salts of
Correct : C. magnesium
2. Select the incorrect statement from the following option.
Correct : D. due to the presence of dissolved hardness- producing salts, the boiling point of water is depressed
3. Select the incorrect statement from the following option.
Correct : D. boiler feed water should also be hard in nature
4. Which of the following is not a unit of hardness?
Correct : B. degree centigrade
5. Hardness of water is conventionally expressed in terms of equivalent amount of
Correct : C. caco3
6. The chemical equivalent of MgSO4 salt is
Correct : D. 70,000
7. 1 ppm =
Correct : C. 0.10fr
8. How many grams of MgCO3 dissolved per litre gives 84 ppm hardness?
Correct : A. 70.56 mg/l
9. EDTA method for hardness determination is a less accurate and inconvenient procedure.
Correct : B. false
10. Estimation of hardness can be determined by types.
Correct : A. 2
11. Total hardness of water can be determined by titrating the fixed volume of water against the standard solution.
Correct : D. alcoholic soap
12. The sodium soap will precipitate all the hardness causing ions into their respective
Correct : C. stereates
13. The water which form lather directly with the soap is called
Correct : B. soft water
14. EDTA method is also called as
Correct : A. complexometric titration
15. The indicator used in the EDTA method is
Correct : D. erichrome black t
16. The change in colour is sharper at the PH of
Correct : B. 10
17. At PH=10, the metal dye complex has the colour
Correct : A. wine red
18. To prepare EDTA solution grams of EDTA is dissolved in the one litre of water.
Correct : D. 4
19. drops of indicator is used in the EDTA method.
Correct : A. 1 to 2 drops
20. The buffer used in the EDTA solution must have the PH of
Correct : C. 10
21. The standard hard water is prepared such that each ml must contain mg of CaCO3.
Correct : A. 1
22. Water is mainly used in boilers for the generation of
Correct : C. steam
23. Which of the following is not a result of the excess of impurity in boiler-feed?
Correct : B. decomposition
24. The scales decrease the efficiency of boiler and chances of explosions are also there.
Correct : A. true
25. Foaming is caused by the formation of
Correct : C. oils and alkalis
26. Corrosion is the decay or disintegration of boiler body material either due to chemical or electrochemical reaction with environment.
Correct : A. true
27. Ion exchange process is also called as
Correct : B. demineralization
28. The operational cost of the ion exchange process is
Correct : B. low
29. The hardness in the ion exchange process is reduced to
Correct : B. 0-2ppm
30. The total are removed completely in the ion exchange process.
Correct : B. dissolved solids
31. In ion exchange process, the iron and manganese ions are removed from the water.
Correct : A. true
32. Water softened during method will be ideal in boilers.
Correct : B. lime soda method
33. The regeneration of acids and alkalis in ion exchange process is
Correct : B. costlier
34. In ion exchange process, the cation exchange resin is generated by passing
Correct : B. dilute acids
35. In the case of the zeolites, ion exchange process do not function properly because of the
Correct : C. turbidity and suspended matter
36. The initial equipment in the ion exchange process is
Correct : A. more
37. The residual hardness after the treatment of water is about
Correct : D. less than 2pmm
38. The continuous supply of soft water can be provided by having
Correct : A. storage facilities
39. The cost of the resins used in the ion exchange process is
Correct : A. high
40. The mineral free water is not used in
Correct : D. drinking
41. In which process of water softening, ion exchange phenomenon takes place?
Correct : B. zeolite process
42. In which process of water softening, the chemicals are added to remove hardness from water?
Correct : A. lime soda process
43. Zeolites are complex compound of
Correct : C. aluminium, silica and soda
44. The color of the artificial zeolite permutit is
Correct : D. white
45. Natural zeolite is mainly processed from
Correct : B. green sand
46. The color of the natural zeolite is
Correct : A. green
47. The chemical formula of Permutit is
Correct : B. sio2al2o3na2o
48. The zeolite process is unsuitable for water containing iron and manganese.
Correct : A. true
49. The thickness of the layers of filter sand of zeolite softener is
Correct : D. 100cm
50. Salt cannot be separated from brackish water by freezing.
Correct : B. false
51. Electrodialysis is based on the fact that the ions present in saline water migrate towards their respective electrodes under the influence of applied
Correct : D. emf
52. The cation selective membrane is embedded with functional groups of
Correct : B. negative charge
53. Electrodialysis is an electrically driven separation conducted at a very low pressure- driven, size-exclusion filtering process.
Correct : A. true
54. The ion-exchange membrane are electrically conductive and are not permeable to flow, even under pressure.
Correct : D. water
55. Select the incorrect statement from the following option.
Correct : D. electrodialysis process is not economical as per capital cost
56. Which one of the following is not a cation exchanger?
Correct : B. triolite
57. The the salt rejection, the better the system is performing.
Correct : A. higher
58. What is the osmotic pressure for sea water?
Correct : D. 2.45 mpa
59. Membrane permeation rate increases proportionally to effective pressure.
Correct : A. true
60. RO membranes are made of
Correct : D. polymer
61. Concentrated seawater which is called
Correct : B. brine
62. 7 REVERSE OSMOSIS.
Correct : A. true
63. The upper limit of brine concentration is
Correct : C. 2.5
64. What is the maximum acceptable limit of temperature for RO?
Correct : C. 40˚c
65. What is the design temperature of RO systems?
Correct : B. 25˚c
66. What is the thumb rule to consider for osmotic pressure?
Correct : A. 1 psi for every 86 ppm of na
67. What is the flux considered while designing a reverse osmosis system for treating RO permeate?
Correct : A. 30-40 lmh
68. What is the flux considered while designing a reverse osmosis system for treating bore well water?
Correct : C. 20-30 lmh
69. What is the flux considered while designing a reverse osmosis system for treating surface water?
Correct : A. 15-22 lmh
70. What is the flux considered while designing a reverse osmosis system for treating surface water with UF system?
Correct : B. 20-30 lmh
71. What do you mean by the term “Sorption”?
Correct : A. attachment
72. The desorption curve is higher than the adsorption curve.
Correct : A. true
73. Which of the following isotherm is applicable to physical adsorption?
Correct : C. freundlich
74. Which type of isotherm is given from the figure, Choose from the following options?
Correct : A. type 1 adsorption isotherm
75. Which of the following statements regarding the physical adsorption of a gas on surface of solid is not correct?
Correct : A. on increasing temperature, adsorption increases continuously
76. Which of the following is not characteristic of chemisorption?
Correct : C. it is multilayer phenomenon
77. For an adsorbant-adsorbate system obeying the Langmuir adsorption isotherm, b = 0.48 bar-1 and p = 0.16 bar-1. At what pressure will 50% of the surface be covered?
Correct : B. 0.07 bar
78. Adsorption of methane follows the Langmuir adsorption isotherm at 90K. If p = 1.896cm3g-1bar-1 and b = 0.146bar-1. Calculate the value of θ.
Correct : D. 0.216 bar
79. In Langmuir’s model of adsorption of a gas on a solid surface the mass of gas striking a given area of surface is to the pressure of the gas.
Correct : A. proportional
80. The physical process that occurs when gas or liquid molecules are brought into contact with a solid surface and condense on the surface
Correct : B. adsorption
81. Adsorption when interaction between the solid and the condensed molecules is relatively strong as contrasted with physical adsorption.
Correct : B. adsorption
82. The gas molecules are held on solid surface by in physical adsorption.
Correct : D. vander waal’s forces
83. The extent of adsorption of a gas on a solid depend on
Correct : D. all of the mentioned
84. Which of the following gases is adsorbed by charcoal?
Correct : A. nh3
85. Langmuir isotherm Mathematical relation for that takes place at equilibrium.
Correct : B. adsorption
86. Adsorption process must be
Correct : C. exothermic
87. The rate law for a reaction between the substances A and B is given by rate = K[A]n [B]m. On doubling the concentration of A and halving the concentration of B. What will be the ratio of the new rate of the earlier rate of the reaction?
Correct : D. 2n-m
88. On which factor the rate constant of a reaction does not depend upon?
Correct : D. concentration of reactants and products
89. The rate of reaction, A + B Products, is given by the equation, r = k[A][B]. If B is taken in excess, what would be the order of reaction?
Correct : B. 1
90. In a reaction, 2A2 + B2 → 2A2B, when the reactant A will disappear?
Correct : D. twice the rate that b will decrease
91. The rate of reaction that does not involve gases, is not dependent on
Correct : A. pressure
92. Which is not true for a second order reduction?
Correct : C. time to complete 75% reaction is twice of half-life
93. The rate of decomposition of a substance increases concentration of substance at same temperature. Find out order of reaction.
Correct : B. 2
94. Molecularity of a reaction is equal to the total number of
Correct : B. reactants taking part in elementary step
95. Which of the following statement is incorrect about the molecularity of a reaction?
Correct : D. it can be zero, fractional or integer
96. Which of the following factor does not effect the rate of reaction?
Correct : C. pressure
97. The reaction rate is greatly influenced by
Correct : C. both nature and strength of the reactant molecules
98. The reactions register an increase in rates in the presence of radiations of specific wavelengths.
Correct : A. true
99. Select the correct option from the following option.
Correct : C. catalyst is used to increase the rate of reaction and remains unaltered chemically during the course of reaction