12th class (Fsc) Chemistry unit 16 MCQs
76. Fungicidess are the pesticides which:
a. Kill plants
b. Control the growth of fungus
c. Kill herbs
d. Kill insects
77. Ecosystem is a smaller unit of:
a. Atmosphere
b. Lithosphere
c. Biosphere
d. Hydroshere
78. The main polluntant of leather tanneries in the water water is due tothe salt of:
a. Copper
b. Lead
c. Chromium (III)
d. Chromium (VI)
79. In purification of portable water the coagulant used is:
a. Barium sulphate
b. Nickel sulphate
c. Alum
d. Copper sulphate
80. The temperature in the non-roating chamber in the incineration of industrial and hazardous waste process has a range:
a. 950 to 1300oC
b. 900 to 1000oC
c. 500 to 900oC
d. 250 to 500oC
81. Newspaper can be recycled again and again by how many times?
a. 4
b. 2
c. 5
d. 3
82. Ecosystem is a similar unit of:
a. Hydrosphere
b. Lithosphere
c. Biosphere
d. Atmosphere
83. Component of environment whihc consist of all water bodies is:
a. Lithosphere
b. Biosphere
c. Atmosphere
d. Hydrosphere
84. The region of earth which is capable of supporting life is:
a. Lithosphere
b. Atmosphere
c. Biosphere
d. Hydrosphere
85. Which gas is not a pollutant?
a. NO2
b. SO2
c. CO2
d. CO
86. The substance which is classified as the secondary pollutant?
a. Sulphur trioxide
b. Ammonia
c. Nitric oxide
d. Ozone
87. The pH of unpolluted rain water is:
a. Less then 5.6
b. 5.0
c. 7.0
d. 5.6
88. The residence time of NO is:
a. 4 days
b. 1-2 years
c. One day
d. Few hour
89. The average residence times of methane in atmosphere is:
a. 3-7 years
b. 2 years
c. 4 days
d. 1-10 years
90. Reducing smog contains high content of :
a. NO
b. NO2
c. CO2
d. SO2
91. The pH of unpolluted rain water should be:
a. 6.50
b. 5.00
c. 7.00
d. 5.60
92. The main pollutant of leather tanneries in the waste water is due to the salt of;
a. Copper
b. Lead
c. Chromium (III)
d. Chromium (VI)
93. The fresh water is being used for domestic purpose is:
a. 69%
b. 8%
c. 100%
d. 23%
94. Following is better to disinfect water:
a. O3
b. CI2
c. KmNO4
d. O2
95. Fungicide are the pesticides which:
a. Kill plants
b. Control the growth of fungus
c. Kill animals
d. Kill insects
96. Biochemical oxygen is demand is the capacity of organic matter in natural water to consume oxygen with in a period:
a. Five days
b. Four days
c. Six days
d. Three days
97. In contact process, the catalyst used for the conversion of sulphur dioxide to sulphur yrioxide is:
a. Aluminum oxide
b. Magnesium oxide
c. Vanadium penatoxide
d. Silicon dioxidea
98. The unpolluted rain water is slightly acidic due to the reaction of rain water with:
a. Oxides of nitrogen
b. Sulphur dioxide
c. Hydrogen present in air
d. carbon dioxide
99. In the Heber’s process for the manufacturing of ammonia, nitrogen is taken from:
a. Air
b. Proteins occurring in livings bodies
c. Mineral containing nitrates
d. Ammonium salts obtained industrially
100. In comparison with oxygen gas, a stong triple bond is present between two nitrogen atoms in a molecule and therefore nitrogen gas is:
a. Very less reactive
b. Highly reactive
c. None of these
d. Completely inert like noble gases