A. Chlorine
B. Washing soda
C. Bleaching powder
D. None of these
Submitted by: Fahad Mehsud
Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble.
Related Mcqs:
- Permanent hardness of water may be removed by the addition of___________?
A. Sodium Carbonate
B. Alum
C. Potassium Permanganate
D. LimeSubmitted by: Warraich
- Permanent hardness of water is due to the presence of __________?
A. Sodium bicarbonate
B. Calcium sulfate
C. Calcium bicarbonate
D. None of theseSubmitted by: Mirza Musawer Jamil
- Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?
A. Zeolites
B. Sulphonides
C. Lime
D. NitratesSubmitted by: Rashid Mehmood
- “Rancidity produced in butter can be decreased by adding quinoline to the butter”. This statements shows that _______________?
A. Nothing is impossible
B. Quinoline is an inhibitor
C. Quinoline is a catalyst
D. Quinoline is an activatorSubmitted by: Mansoor Ul Haque
- 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 - Medium sized kidney stones are removed by__________?
A. Dialysis
B. Lithotripsy
C. Excretion
D. LaserSubmitted by: Rashid Mehmood
- An adult have permanent teeth?
A. 30
B. 40
C. 50
D. 32Submitted by: Muhammad Asif Khajjak
- Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by ________?
A. Conduction
B. Convection
C. Radiation
D. Reflection
E. None of these - Why are soft drink made with chilled water rather than water at room temperature?
A. Ingredients dissolve better in chilled water
B. Chilled water enhances the taste
C. Chilled water attracts more carbon dioxide
D. Chilled water is more hygienicSubmitted by: Ashfaque Ali Khoso
- Underground water and the water on the earth’s surface is called ?
A. Mezosphere
B. Ionosphere
C. Hydrosphere
D. None of theseSubmitted by: Haziq
