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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
Give one word or a phrase:
The property by which certain hydrated salts, when left exposed to atmosphere, lose their water of crystallization and crumble into powder.
The salt prepared by the method of direct combination is _______.
Which of the following salt has a blue colour and why?
CuSO4.5H2O or CuSO4
Write the chemical name and formula of common salt.
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
Complete and balance the following chemical equation:
\[\ce{NaCl_{(aq)} + H2O_{(l)} ->[Electricity]}\]
Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.
The salt whose aqueous solution will have no effect on either red litmus or blue litmus is ______.
A salt whose aqueous solution will have a pH of more than 7 will be ______.
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 questions below relating your answers only to salts in the following list: Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water?
- What name is given to the water in the compound copper sulphate-5-water?
- If copper sulphate-5-water is heated, anhydrous coppersulphate is formed. What is its colour?
- By what means, other than healing, could you dehydrate copper sulphate-5-water and obtain anhydrous coppersulphate?
- Which one of the salts in the given list is deliquescent?
Name two carbonates which do not produce carbon dioxide on heating.
Name a colourless gas which bleaches.
The chemical name of plaster of Paris is ______.
Salt which is formed by the partial replacement of hydrogen ions of an acid by a metal is called ______.
Name the salt formed when sulphuric acid is added to sodium hydroxide and write its pH.
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Sodium zincate
