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 : 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)
Description : Which of the following is not responsible for causing permanent hardness of water? (A) Ca(HCO3 )2 (B) CaCl2 (C) Mgcl2 (D) None of these
Last Answer : (A) Ca(HCO3 )2
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 : calcium sulphate
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 : 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 : Permanent – hardness of water may be removed by addition of (1) Alum (2) Sodium carbonate (3) Lime (4) Potassium Permangante
Last Answer : Sodium carbonate
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 : 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 : Permanent hardness of water cannot be removed by (a) Boiling (b) Adding caustic soda (c) Distillation (d) Adding soda
Last Answer : Ans:(a)
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 : The method that cannot be used for re- moving permanent hardness of water is?
Last Answer : boiling
Description : Permanent hardness of water is due to the presence of which salts
Last Answer : Chlorides and sulphates of Calcium & Magne- sium
Description : How can Permanent hardness of water be removed?
Last Answer : By adding washing soda
Description : Permanent hardness of water can be re- moved by adding?
Last Answer : sodium carbonate or by distillation or by ex- change method
Description : Permanent hardness of water is due to the presence of?
Last Answer : sulphates and chlorides of calcium and magne- sium
Last Answer : bicarbonates of calcium and magnesium
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 : Permanent hardness of water is due to the presence of calcium & magnesium (A) Bi-carbonates (B) Sulphates & chlorides (C) Carbonate (D) None of these
Last Answer : (B) Sulphates & chlorides
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 : Permanent hardness of water can be removed by (A) Addition of soda ash to it (B) Treating it with zeolites (C) Passing it through sodium hexametaphosphate (D) All (A), (B), and (C)
Last Answer : (D) All (A), (B), and (C)
Description : Permanent hardness of water can be removed by (A) Simply boiling (B) Adding alum (C) Passing it through cation & anion exchangers (D) All (A), (B) and (C)
Last Answer : (C) Passing it through cation & anion exchangers
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 : Permanent hardness of water can be removed by (A) Boiling (B) Adding Ca(OH)2 (C) Boiling it with Na2CO3 (D) None of these
Last Answer : (C) Boiling it with Na2CO3
Description : Carbonates in water produce (A) Temporary hardness (B) Permanent hardness (C) Acidity (D) Alkanity
Last Answer : (A) Temporary hardness
Description : Permanent hardness of water can be removed by (A) Adding alum (B) Adding lime (C) Adding chlorine (D) Zeolite process
Last Answer : (D) Zeolite process
Description : Permanent hardness of water may be removed by addition of?
Description : 1. How can Permanent hardness of water be removed? 2. The Sun City is located in which continent? 3. Which situation makes a firm most efficient? 4. On the shore of which counrty cold currents ... Aravalli ranges are an example of which mountains? 20. Which war was ended by the Treaty of Madras?
Last Answer : Answer : 1. By adding washing soda 2. South Africa3. Lowest average costs 4. Peru 5. Ramananda 6. Hydra 7. Dr. B. R. Ambedkar 8. Black 9. North-west Atlantic10. Gulbadan Begam 11. Bangladesh ... Rana Sanga 16. The Cabinet 17. Radio waves 18. Morarji Desai 19. Residual mountains 20. First Mysore war
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 : disinfection
Description : By which reason temporary and permanent hardness occur ?
Last Answer : By which reason temporary and permanent hardness occur ?
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 : The boiling points of the halogens increase going from F2 to I2. What type of intermolecular forces are responsible for this trend? w) permanent dipole x) hydrogen bonding y) ion-ion attraction z) London dispersion forces
Last Answer : ANSWER: Z -- LONDON DISPERSION FORCES
Description : Which of the following reasons are responsible for adoption of post-chlorination of water? 1. Chlorine demand is reduced. 2. Possibility of taste and odour formation is reduced. 3. Possibility of carcinogenic compounds is reduced. 4. Chloramines ... b) 1, 2 & 3 only (c) 1, & 4 only (d) 2, 3 & 4 only
Last Answer : (c) 1, & 4 only
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 : 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 : Name the method used to remove temporary hardness of water?
Last Answer : Ans-Clark s method OR By Boiling
Description : Ethylene diamine tetraacetoacetate (pron: te-tra-a-see-tow-AS-e-tate) (EDTW) is often used for which of the following: w) Determine hardness of water x) Measure the amount of zinc in a solution. y) A preservative in foods z) All of the above
Last Answer : ANSWER: Z -- ALL OF THE ABOVE
Last Answer : Formation of lather with soap
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 : Calcium carbonate equivalents
Description : Maximum permissible concentration of total hardness in drinking water is (1) 50 (2) 100 (3) 200 (4) 500
Last Answer : 200
Last Answer : Calcium, Magnesium
Description : The compounds responsible for causing “socks” to stink are 1. Butyric acid 2. Dimethyl sulphide 3. 2-Heptanone 4. 2-Nonanone 5. 2-Octanone Which compound(s) is/are present in the “socks stink”? (a) 1, 2, 3, 4 and 5 (b) 1, 3, 4 and 5 (c) 1, 2, 3 and 5 (d) 1, 4 and 5
Description : Which of the following constituents present in petroleum is responsible for ash formation? (A) Nitrogen compounds (B) Organometallic compounds (C) Sulphur compounds (D) Oxygen compounds
Last Answer : (C) Sulphur compounds
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : What compounds are responsible for the odors that come from wastewater treatment plants?
Last Answer : Compounds such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide can all contribute to this foul odor
Description : Which of the following is believed to be responsible for the hole in the ozone layer over Antarctic? w) carbon dioxide x) compounds containing sulfur y) radioactivity z) compounds containing chlorine
Last Answer : ANSWER: Z -- COMPOUNDS CONTAINING CHLORINE
Description : _____ gives hardness to stainless steel. (1) Zinc (2) Lead (3) Carbon (4) Tin
Last Answer : (3) Carbon Explanation: Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.