Cleansing Action of Soap

Q. 4 mole of a mixture of Mohrs salt and fe2(so4)3 requires 500 ml of 1 M K2cr2o7 for complete oxidation in acidic media um.mole% of Mohrs salt in mixture is: a-25 b-50 c-60 d-75

Q.

Oil doesn’t dissolve in water.

1. True

2. False

Q.

People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?

Q.

People use a variety of methods to wash cloth. Usually, after adding soap, they 'beat' the clothes on a stone or beat it with a paddle scrub with a brush or agitate the mixture in a

washing machine .Why is this agitation neccessary to get clean clothes?

Q. The hardness of water is due the presence of calcium and salts.

1. calcium
2. magnesium
3. potassium
4. sodium

Q.

The polar end in soap is called hydrophilic end.

1. True

2. False

Q. Polar molecules dissolve in polar solvents.

1. True
2. False

Q.

The cleaning action of soap is due to the formation of micelles in water.

1. False

2. True

Q. The cleaning action of soap is due to the formation of ___ in water.

Q. Question 15
Explain the mechanism of cleansing action of soaps.

Q.

In a soap micelle, the soap molecules are arranged radially with :
(a) ionic ends directed towards the centre and hydrocarbon ends directed outwards
(b) hydrocarbon ends directed towards the centre and ionic ends directed outwards
(c) both ionic ends and hydrocarbon ends directed towards the centre
(d) both hydrocarbon ends and ionic ends directed outwards

Q. In deodorant soaps, the additive added is _________.

1. glycerol
2. stearic acid
3. potassium bicarbonate
4. 3, 4, 5- tribromo salicylaldehyde

Q. Why is it not possible to remove stains with water alone?

1. All of these
2. Water forms a precipitate with the stains and sticks to the clothes.
3. Water is a non polar solvent and hence can not remove the stains.
4. Most stains are oily in nature.

Q. There are two water samples one in test-tube A and another in test-tube B. It was observed that water in both test-tubes A and B does not give lather with soap. However, after boiling the water in both the test-tubes A and B, the water in test-tube B does give lather with soap. Which among the following statements is correct?

1. Water in both the test-tubes is permanent hard water
2. Water in test-tube A is temporary hard water while in test-tube B is permanent hard water
3. Water in test-tube A is permanent hard water while in test-tube B is temporary hard water
4. Water in both the test-tubes is temporary hard water

Q.

Name the product formed when $C{l}_{2}and{H}_2$ produced during the electrolysis of brine are made to combine.

Q.

Hydrophilic molecules are water repellants while hydrophobic molecules are water absorbents.

1. True

2. False

Q. ________________ gives lather even with hard water due to the formation of _______.

1. Soaps, soluble salts
2. Detergents, soluble salts
3. Detergents, insoluble salts
4. Soaps, insoluble precipitates

Q. Which of the following is dry and permanent bleaching agent(1) 03(2) Moist S02(3) H202(4) Cl2 water. Why it can not be H2O2

Q.

Why is pine oil used in froath floatation? Give reason

Q. The ionic end of soap dissolves in , while its carbon chain dissolves in .

1. water
2. oil
3. lather
4. acid

Q.

What are soaps and detergents?

Q.

What can be observed when ${\mathrm{CO}}_2$ gas is bubbled into soap solution?

Q. The _______ end of a soap molecule repels water.

1. hydropilic
2. hydrophobic
3. hydrogenic
4. hyroxide

Q.

Which of the following best describes Micelle?

1. A cluster of soap molecules surrounding the dirt particle.

2. A tadpole shaped fatty acid.

3. Soap molecules in clean water.

4. Drops of oil or dirt that surrounds the molecule.

Q.

What are miscelles?

How are they related with soaps?

Q.

What is miccellls and 3 difference between soaps and detergents ?

Q. Oil doesn’t dissolve in water.

1. False
2. True

Q. Question 10
Explain the formation of scum when hard water is treated with soap.

Q.

77. In deodorant soaps, the additive added in deodorant is

1. glycerol

2. stearic acid

3. potassium bicarbonate

4. 3, 4, 5-Tribromosalicylaldehyde

Q.

The disadvantage of detergents is that they are ________.