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प्रश्न
Define the following term:
Efflorescence
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उत्तर
It is the phenomenon by which hydrated salts, on exposure to dry air, lose their water of crystallization and crumble to powder.
संबंधित प्रश्न
The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.
Write a balanced equation for the preparation of the following salts:
Copper sulphate from Copper Carbonate.
How is common salt obtained from sea-water?
Name three chemicals made from common salt (or sodium chloride).
Give any two uses of common salt (sodium chloride).
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
How would you show that blue copper sulphate crystals contain water of crystallisation?
Name three products of the chlor-alkali process. State two uses of each of these products.
What will be the colour of litmus in an aqueous solution of ammonium chloride salt?
The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
(a) KCl
(b) K2SO4
(c) K2CO3
(d) KNO3
A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:
(a) CH3COONa
(b) Na2CO3
(c) KCl
(d) NH4Cl
Write the name and formula of one salt each which contains:
two molecules of water of crystallisation
You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.
(A) NaCl; Na2SO4; KCl
(B) NaCl; CaCl2; KCl
(C) CaCl2; CaSO4; MgSO4
(D) Na2SO4; CaSO4; MgSO4
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
Answer the following questions below, relating your answers only to salts in the following list:
Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water.
(i) What is the name given to the water in the compound copper sulphate-5-water?
(ii) If copper sulphate-5-water is heated, the water is driven off leaving anhydrous copper sulphate. What is the colour of anhydrous copper sulphate?
(iii) By what means, other than heating, you can dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?
(iv) Which one of the salts in the given list is deliquescent?
Write any five uses of salts.
Many salts absorb water from the atmosphere. This property is called:
A salt that is formed by the complete neutralization of an acid and a base is called ______ salt.
Salt is ______ in nature.
