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प्रश्न
Write the names, formulae and colours of any two hydrated salts.
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उत्तर
- Copper sulphate pentahydrate crystals (CuSO4.5H2O) are blue in colour.
- Iron sulphate heptahydrate crystals (FeSO4.7H2O) are green in colour.
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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
The salt prepared by the method of direct combination is _______.
Name three chemicals made from common salt (or sodium chloride).
The number of molecules of water of crystallisation present in washing soda crystals is ______.
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 ______.
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
What is a ‘salt’?
Name a salt whose solubility decreases with temperature.
State one observation for each of the following :
Lead nitric is heated strongly in a test tube.
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 liberate CO2 when reacted with sodium carbonate?
Name the particles present in :
Strong electrolyte
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
Name two carbonates which do not produce carbon dioxide on heating.
Name gases which has a sour taste.
Write any five uses of salts.
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?
A salt that is formed by the complete neutralization of an acid and a base is called ______ salt.
Salt is ______ in nature.
Salt which is formed by the partial replacement of hydrogen ions of an acid by a metal is called ______.
