Description : Permanent hardness of water is due to the presence of which salts
Last Answer : Chlorides and sulphates of Calcium & Magne- sium
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 : 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 : The hardness of water is due to the pres- ence of which salts?
Last Answer : calcium and magnesium salts
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 : One degree of hardness of water means a content of salts of (A) 10.25 mg/litre (B) 12.25 mg/litre (C) 14.25 mg/litre (D) 16.25 mg/litre
Last Answer : (C) 14.25 mg/litre
Description : Permanent hardness of water is due to the presence of?
Last Answer : sulphates and chlorides of calcium and magne- sium
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 : Temporary hardness of water can be re- moved by?
Last Answer : repeated boiling or adding lime
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 : 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 : 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 : Presence of H2S in raw water (to be chlorinated) results in the (A) Reduced softening capacity of zeolite (B) Increased dosage of chlorine to provide a disinfecting residual in the water (C) Easy removal of its hardness (D) None of these
Last Answer : (B) Increased dosage of chlorine to provide a disinfecting residual in the water
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 : The presence of which of the following salts in water causes corrosion in steam boilers? (1) Sodium Chloride (2) Magnesium Chloride (3) Calcium bicarbonate (4) Potassium bicarbonate
Last Answer : (2) Magnesium Chloride Explanation: Magnesium chloride is the name for the chemical compound with the formula MgCl2 and its various hydrates MgCl2(H2O)x. These salts are typical ionic halides, being highly soluble in water.
Description : Presence of 0.3 to 0.5% arsenic in copper increases its (A) Ductility (B) Malleability (C) Tenacity & hardness (D) Electrical conductivity
Last Answer : (C) Tenacity & hardness
Description : Presence of nitrogen in steel (A) Makes it brittle (B) Increases its strength (C) Increases its hardness (D) Is desirable
Last Answer : (A) Makes it brittle
Description : Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon ... the metal surface) cause nitride formation with increase in surface hardness (D) None of these
Last Answer : (D) None of these
Description : Smith's test of stones is performed to find out (A) The presence of soluble matter of stone (B) The compressive strength of the stone (C) The hardness of the stone (D) The toughness of the stone
Last Answer : Answer: Option A
Description : Gastric lipae is activated in the presence of (A) Bile salts (B) Cu++ (C) K+ (D) Na+
Last Answer : Answer : A
Description : The pancreatic amylase activity is increased in the presence of (A) Hydrochloric acid (B) Bile salts (C) Thiocyanate ions (D) Calcium ions
Last Answer : Answer : B
Description : Conversion of β-carotene into retinal requires the presence of (A) β-Carotene dioxygenase (B) Bile salts (C) Molecular oxygen (D) All of these
Last Answer : Answer : D
Description : Match the items given in column I with those in column II and select the correct option given below. Column I Column II A. Glycosuria (i) Accumulation of uric acid in joints B. Gout (ii) Mass of crystallised salts within the kidney ... (iii) (iv) (c) (ii) (iii) (i) (iv) (d) (iv) (i) (ii) (iii)
Last Answer : (d) (iv) (i) (ii) (iii)
Description : When ammonia is added to an alkyl halide, in the presence of base : (a) primary amines form (b) amides form (c) nitrated alkyl halides form (d) quaternary ammonium salts form
Last Answer : primary amines form
Description : Alkyl halides react with ammonia in the presence of base to form : (a) primary amines (b) nitrated alkyl halides (c) amides (d) quaternary ammonium salts
Last Answer : primary amines
Description : Intestinal bacteria can grow in the presence of __________whereas nonintestinal bacteria are A.bile salts B.low concentration of various dyes C.sugars D.low levels of nitrogen
Last Answer : A.bile salts
Description : Fermentation is adversely affected by the (A) Presence of air (B) Absence of air (C) High concentration (D) Presence of ammonium salts
Last Answer : (C) High concentration
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 : 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 : Hardness of water is caused due to (A) Calcium sulphate (B) Magnesium sulphate (C) Calcium nitrates (D) All the above
Last Answer : (D) All the above
Description : By boiling water, hardness can be removed if it is due to (A) Calcium sulphate (B) Magnesium sulphate (C) Calcium nitrate (D) Calcium bicarbonate
Last Answer : (D) Calcium bicarbonate
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 : Dehydration in human body is caused due to the loss of: (1) vitamins (2) salts (3) hormones (4) water
Last Answer : (4) water Explanation: Dehydration is the condition where there is acute shortage of water in our body. This occurs when the amount of water leaving our body is greater than the ... three types of dehydration: hypotonic or hyponatremic (primarily a loss of electrolytes, sodium in particular).
Description : The movement of water, from one cell of cortex to adjacent one in roots, is due to (a) accumulation of inorganic salts in the cells (b) accumulation of organic compounds in the cells (c) water potential gradient (d) chemical potential gradient.
Last Answer : (c) water potential gradient
Description : Dehydration in human body is caused due to the loss of : (1) vitamins (2) salts (3) hormones (4) water
Last Answer : water
Description : The increase in hardness of metal due to its cold working is termed as the __________ hardening. (A) Work (B) Age (C) Induction (D) Flame
Last Answer : (A) Work