11.2 L of a gas at STP weighs 14 g. Which of the following could be the gas?
Oxygen (O2)
Nitrogen (N2)
Carbon dioxide (CO2)
Hydrogen (H2)
Related Questions
If the volume of a gas at STP is 11.2 L, how many moles of the gas are present?
0.5 mol
1.0 mol
2.0 mol
11.2 mol
What would happen if oxygen availability to activated sludge flocs is reduced?
It will slow down the rate of degradation of organic matter
The centre of flocs will become anoxic, which would cause death
Flocs would increase in size as anaerobic bacteria would grow around flocs
Protozoa would grow in large number
Primary treatment is the
Physical removal of large and small particles from sewage
Biological removal of large and small particles from sewage
Both (1) and (2)
Chemical removal of large and small particles from sewage
If the temperature of a gas at STP is increased to 546.3 K while the pressure remains constant, the new volume of the gas will be:
11.2 L
22.4 L
44.8 L
89.6 L
BOD of waste water is estimated by measuring the amount of
Total organic matter
Biodegradable organic matter
Oxygen evolution
Oxygen consumption
Consider the following statement
I. Biochemical Oxygen Demand (BOD) represents the amount of dissolved oxygen that would be consumed if all the organic matter in 1 L of water were oxidized by microorganism
II. Low value of BOD means the water is either normal or less polluted by organic matter
III. High value of BOD means the water in highly polluted by organic matter
Which of statement given above are correct?
I and II
I and III
II and III
I, II and III
In the process of wastewater treatment, what is the primary input fed into the anaerobic sludge digester to facilitate further decomposition?
Flocculated sludge
Secondary effluent
Raw sewage
Aerated sludge
Which of the following is not used in treatment of polluted water?
Activated carbon
Trickling filter method
Cyclone collector
Activated sludge method
A flask containing a mixture of He and CH4 is maintained at STP. If the partial pressure of He is 0.4 atm, what is the mole fraction of CH4?
0.4
0.6
0.8
1.0
The density of an ideal gas at STP is 1.25 g/L. What is its molar mass?
14 g/mol
28 g/mol
42 g/mol
56 g/mol
