Inorganic impurities causing water pollution is ____________________?

Related Mcqs:

1. Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?

   A. Carbonates
   B. Bi-carbonates
   C. Iron & manganese
   D. Arsenic

2. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?

   A. Coal ash
   B. Potassium cyanide
   C. Ortho-xylene
   D. None of these

3. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

   A. Chemical coagulation
   B. Floatation & skimming
   C. Centrifugation
   D. Ultra filtration

4. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

   A. Chlorine
   B. Alkalis
   C. Benzene hexachloride
   D. Alkyl benzene sulphonate (ABS)

5. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

   A. 102
   B. 105
   C. 109
   D. 1015

6. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?

   A. 84
   B. 88
   C. 80
   D. 92

7. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?

   A. Increases with pressure rise
   B. Decreases with increasing pressure
   C. Becomes zero at the critical point
   D. Both B. & C.

8. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?

   A. Ozone and iodine
   B. Chlorine or its compounds
   C. Ultraviolet light for irradiation of water
   D. All A., B. & C.

9. For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be__________________?

   A. 6738.9
   B. 6753.5
   C. 7058.3
   D. 9000

10. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

    A. PvB
    B. xB.PvB
    C. (Patm – Pvw)xB
    D. xB.Patm