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प्रश्न
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?
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उत्तर
Substance X, which gives sodium hydroxide, Cl2 and H2 upon electrolysis, is Sodium chloride (NaCl). The electrolysis of sodium chloride solution is called the chlor-alkali process because of the products formed, chlor for chlorine and alkali for sodium hydroxide (NaOH).
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संबंधित प्रश्न
Why is sodium chloride required in our body?
Name three chemicals made from common salt (or sodium chloride).
Name the raw material used for the production of caustic soda.
Complete and balance the following chemical equation:
\[\ce{NaCl_{(aq)} + H2O_{(l)} ->[Electricity]}\]
Complete and balance the following chemical equation:
\[\ce{NaCl + NH3 + H2O + CO2 ->}\]
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid.
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
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 less than 7
Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.
|
(1) |
Calcium Sulphate |
(2) |
Sodium Sulphate |
|
(3) |
Calcium Chloride |
(4) |
Potassium Sulphate |
|
(5) |
Sodium Hydrogen Carbonate |
(6) |
Magnesium Chloride |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
Define the following term:
Hygroscopy
What is deliquescence? What name is given to the compounds exhibiting such property?
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Name two carbonates which do not produce carbon dioxide on heating.
Identify the following substance:
Gas C has an offensive smell like rotten eggs.
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 | |
What is the pH of the acid which is used in the formation of common salt?
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
