Permanent hardness of water is due to the presence of __________?

Related Mcqs:

1. Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?

   A. Zeolites
   B. Sulphonides
   C. Lime
   D. Nitrates

   Submitted by: Rashid Mehmood

2. Permanent hardness of water can be removed by adding __________?

   A. Chlorine
   B. Washing soda
   C. Bleaching powder
   D. None of these

   Submitted by: Fahad Mehsud

3. Permanent hardness of water may be removed by the addition of___________?

   A. Sodium Carbonate
   B. Alum
   C. Potassium Permanganate
   D. Lime

   Submitted by: Warraich

4. The yellow colour in photochemical smog is due to the presence of____________?

   A. Sulphur dioxide
   B. Carbon dioxide
   C. Nitrogen dioxide
   D. CFC’s

   Submitted by: Palestine

5. Blood does not coagulate inside the body due to the presence of___________?

   A. Haemoglobin
   B. Fibrin
   C. Heparin
   D. Plasma

   Submitted by: Yaseen Nohri

6. The process of splitting water molecules in the presence of light energy is called_________?

   A. Electrolysis
   B. Photolysis
   C. Radiolysis
   D. Thermolysis

   Submitted by: Malik Asghar Hussain

7. The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in __________ of sea water.

   A. 1 gram
   B. 10 grams
   C. 1 kg
   D. 10 kg

8. An adult have permanent teeth?

   A. 30
   B. 40
   C. 50
   D. 32

   Submitted by: Muhammad Asif Khajjak

9. Brass gets discoloured in air because of the presence of which of the following gases in air ________ ?

   A. Carbon dioxide
   B. Oxygen
   C. Nitrogen
   D. Hydrogen sulphide

   Submitted by: Rashid Mehmood

10. The presence of ice in which region of the moon has been conclusively established?

    A. Southern pole region 
    B. Northern pole region
    C. Equator
    D. All of the above

    Submitted by: Muhammad Abdullah