The compound which when dissolved in water makes the water hard is:

calcium carbonate

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barium sulphate

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calcium bicarbonate

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sodium chloride

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Solution

The correct option is B calcium bicarbonate
The compound which when dissolved in water makes the water hard is calcium bicarbonate.
The hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium.

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Similar questions

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

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

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

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. The hardness of water sample containing 0.002 mol of magnesium sulphate dissolved in a litre of water is expressed as:

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The compound which when dissolved in water makes the water hard is:

The correct option is B calcium bicarbonateThe compound which when dissolved in water makes the water hard is calcium bicarbonate.The hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium.

The correct option is B calcium bicarbonate
The compound which when dissolved in water makes the water hard is calcium bicarbonate.
The hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium.