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प्रश्न
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
- blue litmus red?
- red litmus blue?
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उत्तर
- Neither solution will turn blue litmus red. Solution P (NaCl) is a neutral salt formed from a strong acid (HCl) and a strong base (NaOH). When dissolved in water, it dissociates into Na+ and Cl− ions, which do not react with water. As a result, the concentration of H+ and OH− ions in water remains equal, making the solution neutral. Solution Q (NaOH) is basic, so it won't turn blue litmus red either.
- Sodium hydroxide solution (Q) will turn red litmus paper blue because it is a strong base and releases excess hydroxide ions (OH−) in water.
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संबंधित प्रश्न
State one relevant observation for the following:
Anhydrous calcium chloride is exposed to air for some time.
Give any two uses of common salt (sodium chloride).
Rock salt is mined just like ______.
Complete and balance the following chemical equation:
\[\ce{NaCl_{(aq)} + H2O_{(l)} ->[Electricity]}\]
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
What is meant by ‘hydrated’ salts? Explain with examples.
The products of chloro-alkali process are ______.
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
How many molecules of water of crystallisation (per formula unit) are present in:
Copper sulphate crystals
name two salts which are acidic.
Define the following term:
Efflorescence
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Answer the questions below relating your answers only to salts in the following list: Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water?
- What name is given to the water in the compound copper sulphate-5-water?
- If copper sulphate-5-water is heated, anhydrous coppersulphate is formed. What is its colour?
- By what means, other than healing, could you dehydrate copper sulphate-5-water and obtain anhydrous coppersulphate?
- Which one of the salts in the given list is deliquescent?
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.
One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :
Salt is ______ in nature.
