Advertisements
Advertisements
Question
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
Solution
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 dig out today, was formed.
APPEARS IN
RELATED QUESTIONS
Complete and balance the following chemical equations:
`NaCl + NH_3 + H_2O +CO_2`→
Explain why chlorine is used for sterilising drinking water supply.
Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
The number of molecules of water of crystallisation present in washing soda crystals is:
(a) five
(b) two
(c) ten
(d) seven
Give one example of a salt which gives an aqueous solution having:
pH less than 7
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of these salts will give:
basic solutions (or alkaline solutions)?
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
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?
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Write any five uses of salts.
