Explain one method of removing permanent...

Explain one method of removing permanent hardness.

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The reagent which is not used for removing the permanent hardness of water is :

In zeolites & synthetic resin method which will be more efficient in removing permanent hardness of water :

Describe any two methods that may be used to remove permanent hardness of water.

State two methods to remove temporary hardness.

What do you understand by hardness of water? Describe the permutit and calgon processes used to remove the permanent hardness of water.

Give an equation for the removal of permanent hardness in water.

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

The Reagent which is commercially known as ‘calgon’ that is used to remove the permanent hardness of water in Calgon’s method. Find out the number of moles of calgon required to remove 12 moles of Ca^(2+) ion present in hard water.

Name a process which can remove both temporary and permanent hardness of the water.

The one that is NOT suitable for the removal permanent hardness of water is:

ICSE-SPECIMEN PAPER 3-SECTION II

What do you understand by Hard water
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What are the causes for Permanent hardness
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Explain one method of removing permanent hardness.
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Give the equation for the lab preparation of hydrogen.
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Why the solid reactant is used in granulated form ?
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How is the gas recognised ?
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Mention any two impurities present in hydrogen prepared in laboratory.
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How are these impurities removed ?
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State three precautions taken in preparing hydrogen.
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Give three main characteristics of representative elements.
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