Which of the following pair of ions makes the water hard?

Na^+,SO₄^2-

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K⁺, HCO₃^-

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Ca⁺², NCO₃^-

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NH₄⁺, Cl^-

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Solution

The correct option is B
K⁺, HCO₃^-

${H C O_{3}}^{-}$ is the main reason of temporary hardness of water.

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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 one of the following set of ions represents the collection of isoelectronic species?
[Atomic numbers: F = 9; Cl = 17; Na = 11; Mg = 12; Al = 13; K = 19; Ca = 20; Sc = 21]

Q. Ion concentrations obtained for a groundwater sample (having

p H = 8.10

) are given below.

Ion	$C a^{2 +}$	$M g^{2 +}$	$N a^{+}$	$H C O_{3}^{-}$	$S O_{4}^{2 -}$	$C l^{-}$
Ion concentration $(m g / L)$	$100$	$6$	$15$	$250$	$45$	$39$
Atomic weight	$C a = 40$	$M g = 24$	$N a = 23$	$H = 1$ $C = 12$ $O = 16$	$S = 32$ $O = 16$	$C l = 35.5$

Total hardness

(m g / L a s C a C O_{3})

present in the above water sample is

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^{-}

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Which of the following pair of ions makes the water hard?

The correct option is B K+ , HCO3- HCO3− is the main reason of temporary hardness of water.

The correct option is B
K⁺, HCO₃^-

${H C O_{3}}^{-}$ is the main reason of temporary hardness of water.