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प्रश्न
Which of the following salts will give an aqueous solution having pH of almost 7?
विकल्प
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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| Solution | pH value |
| A | 12 |
| B | 2 |
| C | 7 |
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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?
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
