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प्रश्न
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 |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
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उत्तर
(B)
Hard water contains Ca2+ and Mg2+ ions. So the salts that can be added to water to make it hard are calcium sulphate, calcium chloride and magnesium chloride.
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संबंधित प्रश्न
Write a balanced equation for the preparation of the following salts:
Copper sulphate from copper carbonate.
State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
Write the chemical name and formula of common salt.
What are the two main ways in which common salt (sodium chloride) occurs in nature?
Name the salt which is used as a preservative in pickles, and in curing meat and fish.
Rock salt is mined just like ______.
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
A salt whose aqueous solution will have a pH of more than 7 will be ______.
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
Give four substances which contain water of crystallization and write their common name.
