Advertisements
Advertisements
प्रश्न
Rock salt is mined just like ______.
Advertisements
उत्तर
Rock salt is mined just like coal.
Explanation:
Rock salt is found in large underground deposits formed by the drying up of ancient seas. It is extracted using heavy machinery through traditional underground mining methods, such as room-and-pillar mining. This process of drilling and blasting solid blocks from the earth is identical to how coal is extracted.
APPEARS IN
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, a brown colored gas is evolved.
Write the chemical name and formula of common salt.
Name three chemicals made from common salt (or sodium chloride).
Name the raw material used for the production of caustic soda.
What is a salt?
What will be the colour of litmus in an aqueous solution of ammonium chloride salt?
The products of chloro-alkali process are ______.
How many molecules of water of crystallisation (per formula unit) are present in:
Copper sulphate crystals
Explain ‘salt hydrolysis’
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?
Give four substances which contain water of crystallization and write their common name.
Name a colourless gas which bleaches.
Name gases which has a sour taste.
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 |
Distinguish by a chemical test sodium hydroxide solution and ammonium hydroxide solution.
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?
The acid reacts with a base to form a neutral product called ______.
An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of ______.
