Lime and soda ash are added to water to remove
(A) Bicarbonates & sulphates of calcium and magnesium
(B) Undesirable taste and odour
(C) Bacteria
(D) Its corrosiveness

1 Answer

Answer :

(A) Bicarbonates & sulphates of calcium and magnesium

Related questions

Description : Consider the following statements: 1. Carbonate hardness is due to bicarbonates. 2. Non-carbonate hardness is due to sulphates and chlorides of Ca and Mg. 3. Both the hardnesses can be removed by lime-soda method. 4. Both the hardnesses can be ... (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4

Last Answer : (a) 1, 2 & 3 only

Description : Magnesium and calcium __________ cause temporary hardness of water. (A) Carbonates (B) Bicarbonates (C) Phosphates (D) Sulphates

Last Answer : (B) Bicarbonates

Description : Hardness of water is caused by  (A) Presence of soap lather  (B) Presence of chlorides and sulphates of sodium and potassium  (C) Presence of bicarbonates, sulphates or chlorides of calcium and magnesium  (D) Turbidity 

Last Answer : (C) Presence of bicarbonates, sulphates or chlorides of calcium and magnesium 

Description : Deaeration of water in its treatment is necessary, as it (A) Minimises its turbidity (B) Helps in controlling its taste and odour (C) Minimises its corrosiveness (D) None of these

Last Answer : (C) Minimises its corrosiveness

Description : Hardness of water can be removed by boiling if it is due to  (A) Calcium bicarbonates  (B) Calcium sulphates  (C) Calcium chloride  (D) Calcium nitrates 

Last Answer : (A) Calcium bicarbonates 

Description : The impurity of mixing water which affects the setting time and strength of concrete, is (A) Sodium sulphates (B) Sodium chlorides (C) Sodium carbonates and bicarbonates (D) Calcium bicarbonates

Last Answer : Answer: Option C

Description : . Disinfection of water is done to remove (A) Color (B) Bad taste (C) Foul odour (D) Bacteria

Last Answer : (D) Bacteria

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 : Use of hydrated lime in water treatment (A) Before filtration, reduces the bacterial load on filters (B) After filtration, combats the corrosiveness of water due to the presence of O2 & CO2 (C) Is to adjust the pH value (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Presence of bacteria in potable (drinking) water causes (A) Turbidity (B) Disease (C) Bad odour (D) Bad taste & colour

Last Answer : (B) Disease

Description : Chloramines are used in water treatment for (A) Disinfection and control of taste & odour (B) Corrosion control (C) Removing turbidity (D) Control of bacteria

Last Answer : (A) Disinfection and control of taste & odour

Description : Alkalinity in water may be caused due to (A) Calcium and magnesium bicarbonates (B) Sodium carbonate (C) Potassium carbonate (D) All the above

Last Answer : (D) All the above

Description : Hard water contains  (A) Calcium  (B) Magnesium bicarbonates  (C) Magnesium sulphate  (D) All the above 

Last Answer : (D) All the above 

Description : A child consumes a toxic dose of fluoride. You will:** A. Induce vomiting B. Give a lot of fluids C. Give a lot of fluids and sodium bicarbonates D. Ask patient not to eat for 45 minutes E. Give milk, calcium tablets or magnesium tablets

Last Answer : E. Give milk, calcium tablets or magnesium tablets

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 : . Dechlorination of treated water is necessary to (A) Remove residual turbidity (B) Reduce the bacterial load on filter (C) Control taste and odour (D) Remove chlorinous taste

Last Answer : (D) Remove chlorinous taste

Description : The major constituents of glass are (A) Lime, clay and soda ash (B) Sand, lime and soda ash (C) Silica, alumina and clay (D) Silica, alumina and soda ash

Last Answer : (B) Sand, lime and soda ash

Description : Impurities present in brine is normally removed by treatment with (A) NH3 and CO2 (B) Lime and soda ash (C) Lime, ammonia and carbon (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Solvay process is used for the manufacture of (A) Caustic soda (B) Soda ash (C) Caustic potash (D) Soda lime

Last Answer : (B) Soda ash

Description : (A) Washing soda (B) Soda ash (C) Slaked lime (D) Quicklime

Last Answer : (A) Washing soda

Description : Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes (A) Foaming (B) Odour nuisances (C) Undesirable plant growth (D) Turbidity

Last Answer : (C) Undesirable plant growth

Description : The common name of sodium bicarbonate is - (1) Soda ash (2) Baking soda (3) Soda lime (4) Baking powder

Last Answer : (2) Baking soda Explanation: Sodium bicarbonate (NaHCO3) is also known as baking soda, bread soda, cooking soda, and bicarbonate of soda. It is primarily used in cooking (baking), as a leavening ... of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, etc.

Description : Bleaching powder is made from - (1) Sulphur dioxide and gypsum (2) Chlorine and Charcoal (3) Soda ash and lime (4) Lime and Chlorine

Last Answer : (4) Lime and Chlorine Explanation: The gas which is used in the preparation of bleaching powder is chlorine. It is a mixture of lime and calcium chloride.

Description : The common name of sodium bicarbonate is (1) Soda ash (2) Baking soda (3) Soda lime (4) Baking powder

Last Answer : Baking soda

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 : In primitive days, __________ was being manufactured by Leblanc Process. (A) Alum (B) Washing soda (C) Soda ash (D) Calcium carbide

Last Answer : (C) Soda ash

Description : Commercial production of calcium carbide requires limestone and __________ as raw materials. (A) Coke (B) Sand (C) Soda ash (D) Fuel oil

Last Answer : (B) Sand

Description : Filtration of water is done to remove (A) Colour (B) Odour (C) Turbidity (D) Pathogenic bacteria

Last Answer : (C) Turbidity

Description : Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on (A) Slaked lime (B) Soda lime (C) Calcium perchlorate (D) None of these

Last Answer : (A) Slaked lime

Description : Pick up the incorrect statement from the following: (A) Iron salts produce heavy flocks and hence remove more suspended matter (B) Iron salts remove hydrogen sulphides (C) Iron salts can be used over a limited range of pH values (D) Iron salts impart corrosiveness to water

Last Answer : (C) Iron salts can be used over a limited range of pH values

Description : Workability improved by adding (A) Fly ash (B) Hydrated lime (C) Calcium chloride (D) All the above

Last Answer : Answer: Option D

Description : The workability of concrete can be improved by adding (a) Hydrated lime (b) Fly ash (c) Calcium chloride (d) All the above

Last Answer : (d) All the above

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 : Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger? (A) Corrosiveness & fouling characteristics (B) Pressure (C) Viscosity (D) Density

Last Answer : (D) Density

Description : Bad odour in sanitary latrines is reduced by periodically sprinkling (A) Bleaching powder (B) Lime powder (C) Aluminium sulphate (D) None of these

Last Answer : Option B

Description : Corrosiveness of steam condensate is due to the presence of (A) CO2 (B) Dissolved O2 (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Description : Foul odour and bad taste of water is removed by treating with (A) Alum (B) Bleaching powder (C) Activated carbon (D) Copper sulphate

Last Answer : (C) Activated carbon

Description : The main use of activated carbon in water treatment is to control (A) Bacterial growth (B) Taste and odour (C) Turbidity (D) None of these

Last Answer : (B) Taste and odour

Description : Iron & manganese present as pollutant in water cannot be removed by (A) Ion exchange process (B) Oxidation followed by settling & filtration (C) Lime soda process or manganese zeolite process (D) Chlorination

Last Answer : (D) Chlorination

Description : Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm. (A) 1 (B) 50 (C) 5000 (D) 10000

Last Answer : (B) 50

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 : Hard water for public water supply is discarded because (A) It consumes more soap (B) It contains lot of turbidity (C) It contains pathogenic bacterias (D) It possesses bad taste and odour

Last Answer : (A) It consumes more soap

Description : Disinfection of water with ozone is not good because  (A) It vanishes before water reaches the consumers  (B) It removes the colour, taste and odour from water as bacterias  (C) It adds taste to the water (D) It is more efficient than chlorine in killing bacterias 

Last Answer : (D) It is more efficient than chlorine in killing bacterias 

Description : The pollutants in water can be recognized by a) bad taste b)offensive odour c)growth of aquatic weed d)all the above

Last Answer : d)all the above

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 : Mercaptans are (A) Low boiling sulphur compounds (B) Added in LPG cylinders to detect gas leakage by its smell (C) Undesirable in petrol, as they reduce its octane number (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : A catalyst inhibitor (A) Lessens its selectivity (B) May be useful for suppressing undesirable side reactions (C) Is added in small quantity during the catalyst manufacture itself (D) All (A), (B) and (C

Last Answer : (D) All (A), (B) and (C

Description : Which of the following is resistant to the action of both heat & chemicals? (A) Borosilicate glass (B) Silica glass (C) Soda lime glass (D) None of these

Last Answer : (A) Borosilicate glass

Description : Removal of __________ results from the disinfection of water. (A) Turbidity (B) Odour (C) Hardness (D) Bacteria

Last Answer : (D) Bacteria