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प्रश्न
Which of the following salts will give an aqueous solution having pH of almost 7?
पर्याय
NH4NO3
NH4Cl
CaCl2
KCl
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उत्तर
KCl
Explanation:
KCl is a neutral salt formed from a strong acid (HCl) and a strong base (KOH). When dissolved in water, it completely dissociates into K+ and Cl− ions. Since these ions do not react with water (do not undergo hydrolysis), the natural balance of H+ and OH− ions in water remains undisturbed. This is why an aqueous solution of KCl shows a pH of exactly 7.
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संबंधित प्रश्न
Write a balanced equation for the preparation of the following salt:
Zinc carbonate from zinc sulphate.
State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
Complete and balance the following chemical equation:
\[\ce{NaCl + NH3 + H2O + CO2 ->}\]
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
What happens when a concentrated solution of sodium chloride (brine) is electrolysed? Write the equation of the reaction involved.
The number of molecules of water of crystallisation present in washing soda crystals is ______.
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
A salt whose aqueous solution will have a pH of more than 7 will be ______.
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 equal to 7
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH)2SO4
Which of these salts will give:
- acidic solutions?
- neutral solutions?
- basic solutions (or alkaline solutions)?
What is deliquescence? What name is given to the compounds exhibiting such property?
Distinguish by a chemical test sodium carbonate and sodium sulphite.
Sodium carbonate is a basic salt because it is a salt of a ____________.
Many salts absorb water from the atmosphere. This property is called:
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?
What are hygroscopic substances?
Name the salt formed when sulphuric acid is added to sodium hydroxide and write its pH.
