A water sample, which did not give lather with soap, was found to contain Ca(HCO3)2 and Mg(HCO3)2.

A water sample, which did not give lather with soap, was found to contain Ca(HCO3)2 and Mg(HCO3)2.
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A water sample, which did not give lather with soap, was found to contain Ca(HCO3)2 and Mg ... with soap? Explain with the help of chemical reactions.
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(3) Detergents give lather even with hard water Explanation: Soaps are made of materials found in nature. Detergents are synthetic a big drawback of washing with soap is that the minerals in water react with those in soap, leaving an insoluble film. Detergents react less to minerals in water and for all practical purposes are the product of choice for laundry, unless you have very soft water. On the other hand, soap will combine with the magnesium and calcium ions in hard water to create an insoluble residue that can clog drains and stick to clothing.

Description : (3) Detergents give lather even with hard water Explanation: Soaps are made of materials found in nature. Detergents are synthetic a big drawback of washing with soap is that the minerals in water ... ions in hard water to create an insoluble residue that can clog drains and stick to clothing.

Last Answer : What is the objective of the 'Kyoto Protocol'? (1) To abolish child labour (2) To eliminate nuclear weapons (3) To increase ground water levels (4) To reduce greenhouse gases

(3) Detergents give lather even with hard water Explanation: Soaps are made of materials found in nature. Detergents are synthetic. a big drawback of washing with soap is that the minerals in water react with those in soap, leaving an insoluble film. Detergents react less to minerals in water and for all practical purposes are the product of choice for laundry, unless you have very soft water. On the other hand, soap will combine with the magnesium and calcium ions in hard water to create an insoluble residue that can clog drains and stick to clothing.

Description : (3) Detergents give lather even with hard water Explanation: Soaps are made of materials found in nature. Detergents are synthetic. a big drawback of washing with soap is that the minerals in water ... ions in hard water to create an insoluble residue that can clog drains and stick to clothing.

Last Answer : Cement is usually a mixture of – (1) Calcium silicate and calcium alurninate (2) Calcium silicate and calcium ferrate (3) Calcium aluminate and calcium ferrate (4) Lime stone and silicon dioxide

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

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.

Explain why hard water produces less lather with soap?

Description : Explain why hard water produces less lather with soap?

Last Answer : Ans- Hard water forms scum/precipitate with soap. Soap containing sodium stearate (C17H35COONa) reacts with hard water to precipitate out Ca/Mg stearate.

Pick out the wrong statement. (A) Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action (B) Soap powder is prepared by mixing soap with hydrated sodium carbonate (C) Detergents differ from soaps in their action in hard water (D) Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

Description : Pick out the wrong statement. (A) Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action (B) Soap powder is ... ., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

Last Answer : (D) Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

Hard water (A) Does not affect the lather formation by soap (B) Is not unfit for drinking purpose (C) Pollutes the water stream (D) All (A), (B) and (C)

Description : Hard water (A) Does not affect the lather formation by soap (B) Is not unfit for drinking purpose (C) Pollutes the water stream (D) All (A), (B) and (C)

Last Answer : (B) Is not unfit for drinking purpose

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

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 

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

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 : Formation of lather with soap

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

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

Why does the a bar of soap lather less when it gets smaller?

Description : Why does the a bar of soap lather less when it gets smaller?

Last Answer : Less surface area?

Why does soap lather less as it gets smaller?

Description : Why does soap lather less as it gets smaller?

Last Answer : It doesn't. When the bar is big, it's easy to hold and rub against a washcloth and it lathers easily. When small, it's hard to hold and develop the same friction. What my mother used to do was ... she would get them wet and mash them together and set aside to dry. The larger group was easier to use.

Sulphur addition in soap is done to (A) Improve the soap texture (B) Cure pimples & dandruff (C) Fasten lather formation (D) Increase its cleansing action

Description : Sulphur addition in soap is done to (A) Improve the soap texture (B) Cure pimples & dandruff (C) Fasten lather formation (D) Increase its cleansing action

Last Answer : (B) Cure pimples & dandruff

Which ion is found in greater concentration inside the cell a. K b. Na c. Cl d. HCO3

Description : Which ion is found in greater concentration inside the cell a. K b. Na c. Cl d. HCO3

Last Answer : K

Which ion is found in greater concentration outside the cell a. K b. Na c. Cl d. HCO3

Description : Which ion is found in greater concentration outside the cell a. K b. Na c. Cl d. HCO3

Last Answer : Na

If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l

Description : If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l

Last Answer : ANS: D

The advantage of detergents over soaps is (1) Detergents are soluble in water (2) Detergents could not give much lather (3) Detergents give lather even with hard water (4) Soaps give lather with only soft water

Description : The advantage of detergents over soaps is (1) Detergents are soluble in water (2) Detergents could not give much lather (3) Detergents give lather even with hard water (4) Soaps give lather with only soft water

Last Answer : Detergents give lather even with hard water

Shaving soaps are (A) Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a lasting property (B) Metallic soaps compounded with frothing agents (C) High free alkali soaps having excess of cane sugar and alcohol (D) None of these

Description : Shaving soaps are (A) Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a lasting property (B) Metallic soaps compounded with frothing agents (C) High free alkali soaps having excess of cane sugar and alcohol (D) None of these

Last Answer : (A) Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a lasting property

If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio 1 : 8. This indicates t

Description : If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio 1 : 8. This indicates t

Last Answer : If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen ... proportion C. Reciprocal proportions D. None of these

Which one of the following statements in regard to the excretion by the human kidneys is correct? (a) Descending limb of loop of Henle is impermeable to water.(b) Distal convoluted tubule is incapable of reabsorbing HCO3 – . (c) Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules. (d) Ascending limb of loop of Henle is impermeable to electrolytes.

Description : Which one of the following statements in regard to the excretion by the human kidneys is correct? (a) Descending limb of loop of Henle is impermeable to water. (b) Distal convoluted tubule is ... reabsorbed by the renal tubules. (d) Ascending limb of loop of Henle is impermeable to electrolytes.

Last Answer : (c) Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules.

The predominant action of plasma is (A) HCO3– (B) Cl– (C) HPO4– – (D) SO4 – –

Description : The predominant action of plasma is (A) HCO3– (B) Cl– (C) HPO4– – (D) SO4 – –

Last Answer : Answer : B

For the activity of amylase which of the following is required as co-factor? (A) HCO3 (B) Na+ (C) K+ (D) Cl

Description : For the activity of amylase which of the following is required as co-factor? (A) HCO3 (B) Na+ (C) K+ (D) Cl

Last Answer : Answer : D

Carboxyhemoglobin is formed by (A) CO (B) CO2 (C) HCO3 (D) HCN

Description : Carboxyhemoglobin is formed by (A) CO (B) CO2 (C) HCO3 (D) HCN

Last Answer : Answer : A

In the genetic disorder of cystinuria, the patient excretes large quantities of cystine in their urine and its low solubility causes crystalline cystine to precipitate as stones in kidneys. The remedy involves ingesting Na HCO3. Reaction of this treatment is (A) NaHCO2 combines with cystine (B) NaHCO3 raises the pH above the isoelectric point of cystine (C) NaHCO3 prevents stone formation by hydrolysis of cystine to cysteine (D) None of these

Description : In the genetic disorder of cystinuria, the patient excretes large quantities of cystine in their urine and its low solubility causes crystalline cystine to precipitate as stones in kidneys. The remedy ... C) NaHCO3 prevents stone formation by hydrolysis of cystine to cysteine (D) None of these

Last Answer : Answer : C

Upon the entry of carbon dioxide in the red blood cells, H+ionsare formed at a very rapid rate, and yet the blood does not turn acid because (a) H+ ions are rapidly exchanged at the expense of HCO3-ions (b) H+ ions are rapidly removed and excreted in the urine (c) H+ ions are buffered by proteins of haemoglobin and plasma (d) H+ ions are buffered by proteins of haemoglobin and proteins and phosphates of plasma

Description : Upon the entry of carbon dioxide in the red blood cells, H+ionsare formed at a very rapid rate, and yet the blood does not turn acid because (a) H+ ions are rapidly exchanged at the ... haemoglobin and plasma (d) H+ ions are buffered by proteins of haemoglobin and proteins and phosphates of plasma

Last Answer : Ans:(c)

Which ion moves freely through the plasma membrane a. Na b. Cl c. k d. HCo3

Description : Which ion moves freely through the plasma membrane a. Na b. Cl c. k d. HCo3

Last Answer : Cl

Which ion is actively transported to the outside of cell membrane a. K b. Cl c. Na d. HCo3

Description : Which ion is actively transported to the outside of cell membrane a. K b. Cl c. Na d. HCo3

Last Answer : Na

The plasma membrane in resting condition is almost impermeable to a. K+ b. Na+ c. Cl d. HCo3

Description : The plasma membrane in resting condition is almost impermeable to a. K+ b. Na+ c. Cl d. HCo3

Last Answer : Na+

Cyclic nucleotides exert the following action on salt transport across intestinal mucosal cells: A. Both cyclic AMP and cyclic GMP enhance Cland HCO3 – secretion B. Cyclic AMP enhances but cyclic GMP inhibits Cl– and HCO3 – secretion C. Cyclic AMP inhibits but cyclic GMP enhances Na+ and Cl– reabsorption D. Both cyclic AMP and cyclic GMP enhance Na+ and Cl– reabsorption

Description : Cyclic nucleotides exert the following action on salt transport across intestinal mucosal cells: A. Both cyclic AMP and cyclic GMP enhance Cland HCO3 - secretion B. Cyclic AMP enhances but cyclic GMP ... Cl- reabsorption D. Both cyclic AMP and cyclic GMP enhance Na+ and Cl- reabsorption

Last Answer : A. Both cyclic AMP and cyclic GMP enhance Cland HCO3 – secreti

Consider the following statements: 1. Detergents do not produce lather with hard water 2. Water gas is a mixture of carbon monoxide and hydrogen 3. Methane is the chief constituent of CNG 4. LPG contains mainly n-butane 5. The correct statements are: (a) 1, 2 and 4 only (b) 1,3 and 4 only (c) 2, 3 and 4 only (d) 1, 2 and 3 only

Description : Consider the following statements: 1. Detergents do not produce lather with hard water 2. Water gas is a mixture of carbon monoxide and hydrogen 3. Methane is the chief constituent of CNG 4. LPG contains mainly n-butane 5. The correct ... (b) 1,3 and 4 only (c) 2, 3 and 4 only (d) 1, 2 and 3 only

Last Answer : Ans:(c)

What will the concentration of `[Ca^(+2)]` in a sample of 1 litre hard water if after treatment with washing soda 10 g insoluable `CaCO_(3)` is precip

Description : What will the concentration of `[Ca^(+2)]` in a sample of 1 litre hard water if after treatment with washing soda 10 g insoluable `CaCO_(3)` is precip

Last Answer : What will the concentration of `[Ca^(+2)]` in a sample of 1 litre hard water if after treatment with washing soda 10 g ... B. 0.1 M C. 0.3 M D. 0.4 M

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,

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`

Enhanced facultative reabsorption of water by Vasopressin is mediated by (A) Cyclic AMP (B) Ca++ (C) Cyclic GMP (D) Mg++

Description : Enhanced facultative reabsorption of water by Vasopressin is mediated by (A) Cyclic AMP (B) Ca++ (C) Cyclic GMP (D) Mg++

Last Answer : Answer : A

Presence of sodium tripolyphosphate (an additive) in synthetic detergent (A) Facilitates its use even in hard water (by sequestering the water￾hardening Ca & Mg ions) (B) Inhibits its corrosive effects (C) Does not allow redeposition of dirt on the cleaned surface (D) None of thes

Description : Presence of sodium tripolyphosphate (an additive) in synthetic detergent (A) Facilitates its use even in hard water (by sequestering the water￾hardening Ca & Mg ions) (B) Inhibits its corrosive effects (C) Does not allow redeposition of dirt on the cleaned surface (D) None of thes

Last Answer : (A) Facilitates its use even in hard water (by sequestering the water￾hardening Ca & Mg ions)

An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++ as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is approximately : a) 2.06 b) 6.67 c) 2.67 d) zero

Description : An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++ as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is approximately : a) 2.06 b) 6.67 c) 2.67 d) zero

Last Answer : b) 6.67

The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample of 500 mg of `.^(60)Co` to disintegrate?

Description : The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample of 500 mg of `.^(60)Co` to disintegrate?

Last Answer : The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample ... B. 15.9 years C. 10.6 years D. 5.3 years

3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 dayincubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l

Description : 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 dayincubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l

Last Answer : ANS: C

Why more lather some days than others?

Description : Why more lather some days than others?

Last Answer : Do you use hair products? Daily? Shampoo at irregular intervals or like clockwork? Do you live in an area with climate extremes? Antarctica, Amazon rain forest, Gobi Desert, Equador, as examples (or Seattle?)

Soaps come in different colours. But why is soap's lather always white in colour?

Description : Soaps come in different colours. But why is soap's lather always white in colour?

Last Answer : Lather or foam is nothing but a large collection of small soap bubbles. A soap bubble is , in turn, a very thin film of soap solution enclosing some air. Because of the low surface tension of ... collection of bubbles gets scattered. That is the reason why all kinds of lather or foam appear white.

The volume of nitrogen gas Um (measured at STP) required to cover a sample of silica get with a mono-molecular layer is `129 cm^(3) g^(-1)` of gel. Ca

Description : The volume of nitrogen gas Um (measured at STP) required to cover a sample of silica get with a mono-molecular layer is `129 cm^(3) g^(-1)` of gel. Ca

Last Answer : The volume of nitrogen gas Um (measured at STP) required to cover a sample of silica get with a mono-molecular layer ... `16.2 xx 10^(-20) m^(2).`

How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Description : How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Last Answer : How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Description : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Last Answer : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

For each of the following pairs, indicate which of the two species is of large size :  a. Fe^(2+) or Fe^(3+) b. Mg^(2+) or Ca^(2+)

Description : For each of the following pairs, indicate which of the two species is of large size :  a. Fe^(2+) or Fe^(3+) b. Mg^(2+) or Ca^(2+)

Last Answer : For each of the following pairs, indicate which of the two species is of large size : a. Fe2+ or Fe3+ b. Mg2+ or Ca2+

Na+/K+-ATPase along with ATP requires (A) Ca (B) Mn (C) Mg (D) Cl

Description : Na+/K+-ATPase along with ATP requires (A) Ca (B) Mn (C) Mg (D) Cl

Last Answer : Answer : C

In ricket, the product of Ca x p (in mg/ 100 ml) in serum is below (A) 30 (B) 50 (C) 70 (D) 100

Description : In ricket, the product of Ca x p (in mg/ 100 ml) in serum is below (A) 30 (B) 50 (C) 70 (D) 100

Last Answer : Answer : A

In serum product of Ca x p (in mg/100ml) in children is normally (A) 20 (B) 30 (C) 50 (D) 60

Description : In serum product of Ca x p (in mg/100ml) in children is normally (A) 20 (B) 30 (C) 50 (D) 60

Last Answer : Answer : C

The predominant cation of plasma is (A) Na+ (B) K+ (C) Ca+ (D) Mg++

Description : The predominant cation of plasma is (A) Na+ (B) K+ (C) Ca+ (D) Mg++

Last Answer : Answer : A

Intestinal absorption of chromium is shared with (A) Mn (B) Mg (C) Ca (D) Zn

Description : Intestinal absorption of chromium is shared with (A) Mn (B) Mg (C) Ca (D) Zn

Last Answer : Answer : D

For the activation of long chain fatty acids the enzyme thiokinase requires the cofactor: (A) Mg++ (B) Ca++ (C) Mn++ (D) K+

Description : For the activation of long chain fatty acids the enzyme thiokinase requires the cofactor: (A) Mg++ (B) Ca++ (C) Mn++ (D) K+

Last Answer : Answer : B

Rennin acts on casein of milk in infants in presence of (A) Mg++ (B) Zn++ (C) Co++ (D) Ca++

Description : Rennin acts on casein of milk in infants in presence of (A) Mg++ (B) Zn++ (C) Co++ (D) Ca++

Last Answer : Answer : D

NH+ 4 aminates glutamate to form glutamine requiring ATP and (A) K+ (B) Na+ (C) Ca++ (D) Mg++

Description : NH+ 4 aminates glutamate to form glutamine requiring ATP and (A) K+ (B) Na+ (C) Ca++ (D) Mg++

Last Answer : Answer : D