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प्रश्न
Identify the following solutions, whether they are acid or base.
| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | -- | No change | -- | |
| 2. | -- | -- | Orange colour turns red | |
| 3. | Red litmus turns blue | -- | -- | |
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उत्तर
| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | Blue litmus turns red | No change | The orange colour turns red | Acid |
| 2. | Blue litmus turns red | No change | Orange colour turns red | Acid |
| 3. | Red litmus turns blue | Colourless to pink | The orange colour turns yellow | Base |
संबंधित प्रश्न
Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively. Which one of these is a:
- Weak acid?
- Strong alkali?
Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?
Name one natural source of the following acid:
Citric acid
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again.
- Name the natural indicator present in curry stain.
- Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.
- What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?
It has been found that rubbing vinegar on the stung area of the skin of a person gives him relief. The person has been stung by ______.
What type of ions are formed?
When a base (or alkali) is dissolved in water.
Define a base.
If iron reacts with dilute sulphuric acid, what will be the products?
Give the reaction of acid with nitrates. State the conditions under which they react.
Which of the following is an acid-base indicator?
