Description : Permanent hardness of water can be re- moved by adding?
Last Answer : sodium carbonate or by distillation or by ex- change method
Description : Temporary hardness of water is due to the presence of which salts?
Last Answer : Bicarbonates of Calcium & Magnesium
Description : Temporary hardness of water is due to the presence of?
Last Answer : bicarbonates of calcium and magnesium
Description : Temporary hardness of water is due to the presence of which thing? -General Knowledge
Last Answer : The answer is 'Magnesiumbicarbonate '
Last Answer : answer:
Description : The reaction involved during the removal of temporary hardness of water is:
Last Answer : The reaction involved during the removal of temporary hardness of water is: A. `2CaCl_(2)+(NaPO_(3))_ ... (Delta)rarrCaCO_(3)+H_(2)O+CO_(2)darr`
Description : The temporary hardness of water is due to :
Last Answer : The temporary hardness of water is due to : A. `CaCl_(2)` B. `Ca(HCO_(3))_(2)` C. NaCl D. `Na_(2)SO_(4)`
Description : Which compounds are responsible for permanent and temporary hardness of water?
Last Answer : Ans-Permanent hardness is due to chlorides and sulphates of calcium and magnesium While temporary hardness is due to bicarbonates of calcium and magessium.
Description : Name the method used to remove temporary hardness of water?
Last Answer : Ans-Clark s method OR By Boiling
Description : __________ is removed from water by lime-soda process. (A) Foul smell and taste (B) Iron and manganese (C) Temporary hardness (D) Permanent hardness
Last Answer : (C) Temporary hardness
Description : Presence of __________ hardness is responsible for the temporary hardness in water. (A) Carbonate (B) Calcium (C) Chloride (D) Sulphate
Last Answer : (B) Calcium
Description : . Presence of iron and manganese in water causes (A) Reduction in its dissolved oxygen content (B) Discoloration of bathroom fixtures (C) Temporary hardness (D) None of these
Last Answer : (B) Discoloration of bathroom fixtures
Description : Magnesium and calcium __________ cause temporary hardness of water. (A) Carbonates (B) Bicarbonates (C) Phosphates (D) Sulphates
Last Answer : (B) Bicarbonates
Description : Temporary hardness of water can be removed by (A) Addition of alum (a coagulant) (B) Boiling (C) Filtration (through gravity sand filter) (D) Addition of lime
Last Answer : (B) Boiling
Description : Pick out the true statement pertaining to water treatment. (A) Slow sand filters can remove colour completely (B) Activated carbon can be used for taste & odour control without subsequent filtration ... of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Last Answer : (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Description : Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of (A) Calcium sulphate (B) Sodium chloride (C) Sodium sulphate (D) Magnesium chloride
Last Answer : (B) Sodium chloride
Description : Which of the following processes can remove both temporary as well as permanent hardness of water? (A) Filtration (B) Boiling (C) Distillation (D) None of these
Last Answer : (C) Distillation
Description : Carbonates in water produce (A) Temporary hardness (B) Permanent hardness (C) Acidity (D) Alkanity
Last Answer : (A) Temporary hardness
Description : The temporary hardness of water can be removed by (A) Boiling (B) Adding lime (C) Adding alum (D) Filtration
Last Answer : (A) Boiling
Description : By which reason temporary and permanent hardness occur ?
Last Answer : By which reason temporary and permanent hardness occur ?
Description : Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is ... (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings
Last Answer : (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs
Description : The method that cannot be used for re- moving permanent hardness of water is?
Last Answer : boiling
Description : Iron and manganese present as pollutants in water cannot be re-moved by - (1) oxidation followed by settling and filtration (2) chlorination (3) ion exchange process (4) lime soda process or manganese zeolite process
Last Answer : (2) chlorination Explanation: Water chlorination is the process of adding chlorine or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is ... is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.
Description : I am in France for now on a temporary student visa. Can I go to Scotland and re-enter the country?
Last Answer : What passport are you traveling on?
Description : Write the chemical name and chemical formula of the salt used to remove permanent hardness of water. -Science
Last Answer : Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water.
Description : Permanent hardness of water cannot be removed by (a) Boiling (b) Adding caustic soda (c) Distillation (d) Adding soda
Last Answer : Ans:(a)
Description : Permanent hardness of water is due to the presence of which salts
Last Answer : Chlorides and sulphates of Calcium & Magne- sium
Description : The hardness of water is due to the pres- ence of which salts?
Last Answer : calcium and magnesium salts
Description : Permanent hardness of water is due to the presence of?
Last Answer : sulphates and chlorides of calcium and magne- sium
Description : The compound of silicon used in removing hardness of water is
Last Answer : Zeolite.
Description : Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal the hardness of water and a gas C is evolved. The gas C when passed through lime water ,turns it ... © A is baking soda ,B is washing soda and C is carbon dioxide (d) both a and c
Last Answer : (d) both a and c
Description : The salt which is used to remove the hardness of water is (A) NaOH (B)Baking Soda (C) Bleaching powder (D) All of these
Last Answer : (C) Bleaching powder
Description : What is the hardness of water due to?
Last Answer : The hardness of water is due to some chemicals that get. Dissolved in rain water when it falls.
Description : How can Permanent hardness of water be removed? -Do You Know?
Last Answer : A few methods to remove hardness from water are,Chemical Process of Boiling Hard Water.Adding Slaked Lime (Clark's Process)Adding Washing Soda.Calgon Process.Ion Exchange Process.Using Ion Exchange Resins.
Description : hello when I test the water in the aquarium (ph, no3, etc.) and if it does not meet the requirements of fish and plants how to change the hardness of the water, ph, etc.? Thank you
Last Answer : Need Answer
Description : Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcuim bicarbonate and 74.5 ppm of potassium chloride is :
Last Answer : Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcuim bicarbonate and 74.5 ppm ... : A. 8 B. 4 C. 3 D. 2
Description : the hardness of a water sample (in terms of Equivalents of `CaCO_(3)`) containing `10^(-3)MCaSO_(4)` Is : (Molar mass of `CaSO_(4)=1365h mol^(-1)`)
Last Answer : the hardness of a water sample (in terms of Equivalents of `CaCO_(3)`) containing `10^(-3)MCaSO_(4)` Is : ( ... 10 ppm B. 50 ppm C. 90 ppm D. 100 ppm
Description : The amount of lime, `Ca(OH)_(2)` required to remove the hardness in 60 L of pond water containing 1.62 mg of calcium bicarbonate per 100 ml of water,
Last Answer : The amount of lime, `Ca(OH)_(2)` required to remove the hardness in 60 L of pond water containing 1.62 mg of ... 0.222g` C. `2.22 g` D. `0.444 g`
Description : What is EDTA why it is used for treating hardness of water?
Last Answer : EDTA is ethylenediaminetetraacetic acid; the chemical formula is C10H16N2O8.EDTA can react with calcium and magnesium ions forming insoluble precipitates.
Description : Just filled our above ground 18ft round pool with water. About 24 hours later there is a green look to it. We haven't even used it yet. Is this because of our water hardness level. We have very hard water.(from well) What can be done to clear up the water?
Last Answer : Your water is turning green due to algae. You need to scrub your pool walls to and then "Shock" your pool by adding chlorine. Keep your pool filtered and it should clear up in a few days.
Description : In water treatment plant, use of chloramines ensures (1) taste and odour control (2) weed control in reservoirs (3) disinfection (4) removal of permanent hardness
Last Answer : (3) disinfection Explanation: The particular type of chloramine used in drinking water disinfection is called monochloramine. Chloramine is chiefly a secondary disinfectant that are added to water that has already been disinfected with a primary disinfectant, often chlorine
Description : Hardness of the water is commonly measured in terms of - (1) Calcium carbonate equivalents (2) Calcium sulphate equivalents (3) Magnesium carbonate equivalents (4) Magnesium sulphate equivalents
Last Answer : (1) Calcium carbonate equivalents
Description : Maximum permissible concentration of total hardness in drinking water is – (1) 50 (2) 100 (3) 200 (4) 500
Last Answer : (3) 200 Explanation: Maximum permissible concentration of total hardness in drinking water in 200.
Description : The two metal ions that cause hardness to water are: (1) Calcium, Magnesium (2) Sodium, Calcium (3) Sodium, Potassium (4) Sodium, Magnesium
Last Answer : (1) Calcium, Magnesium Explanation: Calcium and magnesium ion cause hardness of water.
Description : Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of (1) Nitrates (2) Zeolites (3) Sulphonates (4) None of these
Last Answer : (2) Zeolites Explanation: Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
Description : Which method will be employed to test the hardness of water? (1) Boiling (2) Distillation (3) Formation of lather with soap (4) None of these
Last Answer : (3) Formation of lather with soap Explanation: Soap solution is used to measure the hardness of rain water, temporarily hard water and sea-water. Hard water does not form soap lather. This is ... in hard water react with soap to form calcium stearate or magnesium stearate and thus forms scum.
Description : Permanent - hardness of water may be removed by addition of – (1) Alum (2) Sodium carbonate (3) Lime (4) Potassium Permangante
Last Answer : (2) Sodium carbonate Explanation: Sodium carbonate (also known as washing soda or soda ash) is a sodium salt of carbonic acid. In domestic use, it is used as a water softener in laundering. It ... with the detergent being used. Sodium carbonate can be used to remove grease, oil and wine stains.
Description : Which of the following is responsible for permanent hardness of water? (1) magnesium bicarbonate (2) sodium chloride (3) calcium sulphate (4) calcium bicarbonate
Last Answer : (3) calcium sulphate Explanation: Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling). Hard water contains dissolved magnesium and calcium ions. These make ... . Temporary hardness is caused by dissolved calcium hydrogen carbonate (which is removed by boiling)