Match the column:-

Column I Column II
A. Heavy water P. Bicarbonates of Ca & Mg
B. Temporary hardness Q. No foreign ions
C. Soft water R.  D2O
D. Permanent Hardness S. Sulphates of Ca & Mg
 
A B C D
1. S P Q R
2. R P Q S
3. P Q R S
4. S R P Q
Subtopic:  Hard & Soft Water |
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Match the items in Column I with the relevant items in Column II.

Column I Column II
A. Hydrogen peroxide is used as a 1. Sodium hexametaphosphate
B. Used in Calgon method 2. Clark's method
C. Temporary hardness of hard water is removed by 3. Reducing agent

Codes

A B C
1. 3 2 1
2. 1 2 3
3. 3 1 2
4. 2 1 3
Subtopic:  Hard & Soft Water |
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The softening of hard water by synthetic ion-exchange resins is based on -

1. Increasing the lattice energy.

2. Physical separation.

3. Lowering the activation energy.

4. Exchange of cations and anions.

Subtopic:  Hard & Soft Water |
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 Hardness of water cannot be removed by -

1. Clark's method

2. Adding washing soda

3. Calgon process

4. Filtration

Subtopic:  Hard & Soft Water |
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A water softening reagent among the following is -

1. Ca3(PO4)2

2. Na3PO4

3. Na6P6O18

4. Na2HPO4

Subtopic:  Hard & Soft Water |
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The method used to remove the temporary hardness of water is-

1. Synthetic resins method

2. Calgon's method

3. Clark's method

4. Ion-exchange method

Subtopic:  Hard & Soft Water |
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Permutit is chemically known as:

1. Hydrated sodium aluminium silicate

2. Sodium hexa meta-phosphate

3. Sodium silicate

4. Sodium meta-aluminate

Subtopic:  Hard & Soft Water |
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When zeolites (hydrated sodium aluminum silicate) is treated with hard water, the sodium ions are exchanged with:

1. H+ ion

2. Ca2+ ion

3. SO42- ion

4. OH- ion

Subtopic:  Hard & Soft Water |
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The temporary and permanent hardness of water is caused by -
1. Permanent hardness is caused by hydrogen carbonates and temporary hardness is caused by chlorides.

2. Temporary hardness is caused by dihydrogen and permanent hardness is caused by oxides.
3. Temporary hardness is caused by insoluble hydrogen carbonates and permanent hardness is caused by chlorides.
4. Temporary hardness is caused by hydrogen carbonates and permanent hardness is caused by chlorides.

Subtopic:  Hard & Soft Water |
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A 1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. The hardness of the solution is:

1. 10 ppm

2. 100 pm

3. 1000 ppm

4. 10000 ppm

Subtopic:  Hard & Soft Water |
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