Hardness of H 2 O is due toA- C a2- and M g2-B- HCO 3-C- N a -D- K -

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Standard IX

Chemistry

Hardness of Water:Causes, Types and Treatments

Hardness of H...

Question

Hardness of $H_{2} O$ is due to

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Solution

The correct option is A
Hardness of water is of two types – temporary and permanent. Temporary hardness is caused
by bicarbonates of $C a^{2 ⨁} a n d M g^{2 ⨁}$ whereas permanent harness is caused by sulphates of the
same elements.

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Similar questions

Q. Temporary hardness is due to

H C O_{3}^{-}

M g^{2 +}

and

C a^{2 +}

. It is removed by addition of

C a O

C a (H C O_{3})_{2} + C a O ⟶ 2 C a C O_{3} + H_{2} O

Mass of

C a O

required to precipitate

2

C a C O_{3}

is :

Question 15

Which of the following ions will cause hardness in water sample?

(a) $C a^{2 +}$ (b) $N a^{+}$ (c) $C l^{-}$ (d) $K^{+}$

The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+}, C a^{2 +}, M g^{2 +}, B e^{2 +}$

Q. Hydration Energy of

M g^{2 +}

is lower than that of:

Q. Temporary hardness is due to bicarbonates of

M g^{2 +}

and

C a^{2 +}

. It is removed by addition of CaO as follows:

C a (H C O_{3})_{2} + C a O \to 2 C a C O_{3} + H_{2} O

Mass of CaO required to precipitate

2 g C a C O_{3}

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Hardness of H2O is due to

The correct option is A Hardness of water is of two types – temporary and permanent. Temporary hardness is caused by bicarbonates of Ca2⨁and Mg2⨁ whereas permanent harness is caused by sulphates of the same elements.

Hardness of $H_{2} O$ is due to

The correct option is A
Hardness of water is of two types – temporary and permanent. Temporary hardness is caused
by bicarbonates of $C a^{2 ⨁} a n d M g^{2 ⨁}$ whereas permanent harness is caused by sulphates of the
same elements.