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प्रश्न
Define the following term: Hygroscopy.
उत्तर
Hygroscopy: It is the phenomenon by which substances absorb moisture from air, but only sufficiently so as to become wet.
संबंधित प्रश्न
Identify the substance underlined, in the following case
A solid formed by reaction of two gases, one of which is acidic and the other basic in nature
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
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.
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
Name the raw material used for the production of caustic soda.
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid
Write the names, formulae and colours of any two hydrated salts.
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 X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
Write the name and formula of one salt each which contains:
two molecules of water of crystallisation
name two salts which are neutral, when dissolved in water.
The pH values of three solutions A, B and C are given in the table. Answer the folloiwng questions:
| Solution | pH value |
| A | 12 |
| B | 2 |
| C | 7 |
Which solution will have no effect on litmus solution?
What is deliquescence? What name is given to the compounds exhibiting such property?
Give four substances which contain water of crystallization and write their common name.
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
Name gases which has a sour taste.
Salt is ______ in nature.
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
