The main pollutant of leather tanneries in the waste water is____________________?

Related Mcqs:

1. The percentage of suspended solid waste in raw water is removed by coagulation is__________________?

   A. 60
   B. 70
   C. 80
   D. 90

2. The medium which interact with long lived pollutant is:_____________?

   A. Source
   B. Receptor
   C. Sink
   D. All of them

   Submitted by: Said wali shah

3. Biodegradable pollutant is:_____________?

   A. DDT
   B. mercury salt
   C. Domestic waste
   D. Aluminum foil

   Submitted by: Said wali shah

4. Chlorination of water may be harmful if the water contains_________________?

   A. Ammonia
   B. Dissolved oxygen
   C. Carbon dixide
   D. All

5. Empirical formula of chloroform is____________________?

   A. CH2 C12
   B. CH3C1
   C. CC14
   D. CHCL3

6. The most paramagnetic element is____________________?

   A. Iron
   B. Cobalt
   C. Chromium
   D. Manganese

7. In K2Cr2O7 the oxidation number of chromium is____________________?

   A. 7
   B. 6
   C. -7
   D. -6

8. The correct electronic configuration of Cr is____________________?

   A. [Ar]4s23d4
   B. [Ar] 4s23d4
   C. [Ar]4s03d5
   D. [Ar]4s13d5

9. The metal which is used in thermite process because of its activity is____________________?

   A. iron
   B. copper
   C. aluminium
   D. zinc

10. Phosphoric acid is a weak acid and its basicity is____________________?

    A. 1
    B. 3
    C. zero
    D. 2