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प्रश्न
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
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उत्तर
The common salt mined from underground deposits is called rock salt. When ancient seas dried up by evaporation thousands of years ago, rock salt, which we mine today, formed.
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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
Write a balanced equation for the preparation of the following salts:
Copper sulphate from copper carbonate.
Name three chemicals made from common salt (or sodium chloride).
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
Name three products of the chlor-alkali process. State two uses of each of these products.
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
- blue litmus red?
- red litmus blue?
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?
Give one example of a salt which gives an aqueous solution having:
pH less than 7
Give one example of a salt which gives an aqueous solution having:
pH more than 7
Explain ‘salt hydrolysis’
State one observation for each of the following :
Lead nitric is heated strongly in a test tube.
Fill in the blank
___________ is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.
Distinguish by a chemical test sodium hydroxide solution and ammonium hydroxide solution.
The acid reacts with a base to form a neutral product called ______.
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
