Which of the following ions will cause hardness in water ?

C a^{2 +}

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N a^{+}

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C l^{-}

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K^{+}

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Solution

The correct option is A $C a^{2 +}$
Hardness in water is due to the presence of $C a^{2 +}$ and $M g^{2 +}$ ions, which form insoluble salts in it.

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Question 15

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

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

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

A water contains the following dissolved ions.
$[N a^{+}] = 56 m g / L; [C a^{2 +}] = 40 m g / L;$
$[M g^{2 +}] = 30 m g / L; [A l^{3 +}] = 3 m g / L;$
$[H C O_{3}^{-}] = 190 m g / L; [C l^{-}] = 165 m g / L;$
Water $p H$ is $7$ .
Atomic weights:
$C a = 40, M g = 24, A l = 27, H = 1, C = 12, O = 16, N a = 23, C l = 35.5$

The non-carbonate hardness of the sample in $m g / L$ as $C a C O_{3}$ is

Q. Which one of following species are isoelectronic?

S^{2 -}, N a^{+}, C a^{2 +}, C l^{-}

Q. Which of the following ions causes the hardness of water?

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Which of the following ions will cause hardness in water ?

The correct option is A Ca2+Hardness in water is due to the presence of Ca2+ and Mg2+ ions, which form insoluble salts in it.

The correct option is A $C a^{2 +}$
Hardness in water is due to the presence of $C a^{2 +}$ and $M g^{2 +}$ ions, which form insoluble salts in it.