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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
From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]
On heating, this salt gives a yellow residue when hot and white when cold
The salt prepared by the method of direct combination is _______.
How is common salt obtained from sea-water?
Why is sodium chloride required in our body?
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
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 ______.
When the concentrated aqueous solution of substance X is electrolysed, then NaOH, Cl2 and H2 are produced. Name the substance X. What is the special name of this process?
Name a salts whose solubility increases with temperature.
name two salts which are basic.
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
Name the particles present in :
Strong electrolyte
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
Identify the following substance:
Gas C has an offensive smell like rotten eggs.
Differentiate hydrate and anhydrous salts with examples.
Which of the following is not an acidic salt?
One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :
Acids react with metallic oxides to produce ______.
Name the salt formed when sulphuric acid is added to sodium hydroxide and write its pH.
