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1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
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-1
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The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting
[3Ca3 (PO4)2.Ca(OH)2] to
A
[3{Ca(OH)2}. CaF2]
B
[CaF2]
C
[3(CaF2). Ca(OH)2]
D
[3Ca3(PO4)2. CaF2]
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
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-1
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Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
A
Aerobic bacteria decrease the BOD value.
B
Anaerobic bacteria increase the BOD value.
C
Clean water has BOD value higher than 10 ppm.
D
Polluted water has BOD value higher than 10 ppm.
3
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
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Which of the following is a set of greenhouse gases?
A
CH4, O3, N2, SO2
B
O3, N2, CO2, NO2
C
O3, NO2, SO2, Cl2
D
CO2, CH4, N2O, O3
4
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
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Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
A
O3 and CO2
B
CO2 and NO2
C
SO2 and NO2
D
SO2 and O3
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