In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following grous of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard :

sodium chloride, calcium chloride

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potassium chloride, sodium chloride

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sodium chloride, magnesium chloride

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calcium chloride, magnesium chloride

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Solution

The correct option is D calcium chloride, magnesium chloride
Water described as "hard" is high in dissolved minerals, specifically calcium and magnesium. Calcium and magnesium dissolved in water are the two most common minerals that make water "hard." Calcium chloride and magnesium chloride can be dissolved in distilled water to make it hard.

Hence, calcium chloride and magnesium chloride when dissolve in water make it hard.

Therefore, option D is correct.

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Similar questions

Q. In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water will make it hard :

(a) Sodium chloride, calcium chloride

(b) Potassium chloride, sodium chloride

(c) Sodium chloride, magnesium chloride

(d) Calcium chloride, magnesium chloride

Q. A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, which when dissolved in distilled water will make it hard.
(a) Sodium chloride, Potassium chloride
(b) Sodium sulphate, Potassium sulphate
(c) Sodium sulphate, Calcium sulphate
(d) Calcium sulphate, Magnesium chloride

Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment

(1) Calcium Sulphate

(2) Sodium Sulphate

(3) Calcium Chloride

(4) Potassium Sulphate

(5) Sodium Hydrogen Carbonate

(6) Magnesium Chloride

Q. Hard water required for an experiment is not available in a school laboratory. However, the following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment :

(1) calcium sulphate
(2) sodium sulphate
(3) calcium chloride
(4) potassium sulphate
(5) sodium hydrogen carbonate
(6) magnesium chloride

Select from the following group of these salts which may be dissolved in water to make it hard.

(I) Sodium chloride
(II) Sodium sulphate
(III) Calcium chloride
(IV) Calcium sulphate
(V) Potassium chloride
(VI) Magnesium sulphate

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