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प्रश्न
Define the following term:
Hygroscopy
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उत्तर
It is the phenomenon by which substances absorb moisture from air, but only sufficiently so as to become wet.
संबंधित प्रश्न
State what would you observe when Washing Soda Crystals are exposed to the atmosphere
State one relevant observation for the following:
Anhydrous calcium chloride is exposed to air for some time.
What are the two main ways in which common salt (sodium chloride) occurs in nature?
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.
Which of the following salts will give an aqueous solution having pH of almost 7?
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
- blue litmus red?
- red litmus blue?
Give one example of a salt which gives an aqueous solution having:
pH more than 7
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
Define the following term:
Efflorescence
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
Distinguish by a chemical test sodium carbonate and sodium sulphite.
Differentiate hydrate and anhydrous salts with examples.
Write any five uses of salts.
Which of the following is not an acidic salt?
Many salts absorb water from the atmosphere. This property is called:
The chemical name of plaster of Paris is ______.
Acids react with metallic oxides to produce ______.
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:
Ferric chloride
