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प्रश्न
What will be the colour of litmus in an aqueous solution of ammonium chloride salt?
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उत्तर
Blue litmus turns red. The NH4Cl is formed from a weak base, ammonium hydroxide (NH4OH), and a strong acid, hydrochloric acid (HCl). So, when dissolved in water, NH4Cl will hydrolyse to form more H+ ions than OH− ions, making it acidic.
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संबंधित प्रश्न
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 a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
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?
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)?
Write the name and formula of one salt which contains:
Five molecules of water of crystallisation.
How many molecules of water of crystallisation (per formula unit) are present in:
Copper sulphate crystals
What is a ‘salt’?
The pH values of three solutions A, B and C are given in the table. Answer the following questions:
| Solution | pH value |
| A | 12 |
| B | 2 |
| C | 7 |
- Which solution will have no effect on litmus solution?
- Which solution will liberate CO2 when reacted with sodium carbonate?
- Which solution will turn red litmus solution blue?
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?
Define the following term:
Hygroscopy
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 |
Write any five uses of salts.
Salt is ______ in nature.
What are hygroscopic substances?
How is normal salt obtained? Give a suitable reaction.
An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of ______.
