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Standard XI
Chemistry
Structure and Properties of Water
Question

Treatment with lime remove hardness of water caused by:

A
$$CaSO_4$$
B
$$CaCl_2$$
C
$$Ca(HCO_3)_2$$
D
$$CaCO_3$$
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Solution
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Correct option is C. $$Ca(HCO_3)_2$$
Clark's process is a method for the removal hardness of the water in this process slaked lime(lime water), $$Ca(OH)_2$$ is added to temporary hard water.
Insoluble calcium carbonate precipitates out and no longer produce hardness.

$$Ca(HCO_3)_2+Ca(OH)_2\rightarrow 2CaCO_3+2H_2O$$

Hence option C is correct

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Similar Questions
Q1
Treatment with lime remove hardness of water caused by:
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Q2
Treatment with lime can remove hardness of water caused by:
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Q3

Statement-1 : In clarks process excess of lime is not added to water sample to remove temporary hardness.
Statement-2 : Addition of excess of milk of lime causes permanent hardness.
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Q4
Reason
Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates
Assertion
Permanent hardness of water is removed by treatment with washing soda.
Permanent hardness of water is removed by treatment with washing soda.
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Q5

Temporary hardness can be removed by mixing water with slaked lime, this process is known as softening of water.


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