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Question

The compound which is used for removing permanent hardness of water is :

A
$$ CuSO_4 . 5H_2O $$
B
$$ NaHCO_3 $$
C
$$ Na_2CO_3 $$
D
$$ Na_2CO_3 . 10 H_2O $$
Solution
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Correct option is D. $$ Na_2CO_3 . 10 H_2O $$
$$ Na_2CO_3 . 10 H_2O $$ $$\text { commonly known as washing soda is used for removing permanent hardness of water . }$$

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