Assertion (A) Synthetic detergents can lather well in hard water.Reason (R) Synthetic detergents form soluble calcium and magnesium salts with hard water.

Assertion (A) : Synthetic detergents can lather when in hard water.
Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true but R is not a correct explanation of A

C

A is true but R is false

D

A is false but R is true

Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statement : Detergents should be used to clean clothes.

Assumptions :
I. Detergents form more lather.
II. Detergents help to dislodge grease and dirt.

A

Only assumption I is implicit

B

Only assumption II is implicit

C

Either I or II is implicit

D

Neither I nor II is implicit

E

Both I and II are implicit

Which of the following statement(s) is/are correct?
1. If sodium carbonate and washing soda is mixed in water the hardness of water can be removed.
2. The reaction of the chemicals produce sodium sulphate, sodium carbonate and insoluble calcium carbonate.
3. Magnesium sulphate chloride and magnesium carbonate is also produced.
Select the correct answer

A

Only 1

B

1, 2 and 3

C

2 and 3

D

None of these

The detergents which bear negative charge at the soluble end of the chain are called anionic detergents.

A

True

B

False

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

Consider the following statements.
1. Hard soaps (common bar soaps) are the sodium salts of fatty acids.
2. Soft soaps are the potassium salts of fatty acids and semi-solid in nature.
Which of the statement(s) given above is/are correct?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 nor 2

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Clothes are not washed properly in hard water. Reason (A) : Hard water contains many minerals.

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false but R is true.

The process of removing calcium and magnesium from hard water is known as

A

Sedimentation

B

Filtration

C

Flocculation

D

Water softening

________ is the removal of calcium, magnesium and certain other metal cations in hard water.

A

Disinfection

B

Sedimentation

C

Softening

D

Cleaning

Consider the following statements and choose the correct answer:
1. Transpiration usually occurs during day-time whereas guttation takes place in night
2. In transpiration water comes out in the form of liquid, whereas in guttation the water is given off in the form of vapour
3. Transpiration water is pure but guttation water contains inorganic salts and sugars
4. Transpiration is a controlled phenomenon whereas guttation is an uncontrolled phenomenon

A

Only 1, 2 and 3 are true

B

Only 1, 3 and 4 are true

C

Only 3 and 4 are true

D

1, 2, 3 and 4 are true

Assertion (A) Synthetic detergents can lather well in hard water.
Reason (R) Synthetic detergents form soluble calcium and magnesium salts with hard water.

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