Advertisements
Advertisements
प्रश्न
Heshna and Keerthi are friends. Keerthi’s teeth are white without caries, but Heshna has teeth with caries. Why? How is it formed?
Advertisements
उत्तर
- Caries are caused by the action of acids on the enamel surface.
- The acid is produced when sugar in foods or drinks reacts with bacteria present on the tooth surface.
- Heshna has not cleaned her teeth well after sipping sugary drinks and snacking.
- She has to brush after meals and before bed.
APPEARS IN
संबंधित प्रश्न
State some of the uses of mineral acids in industry.
Which acid is produced in our stomach? What happens if there is an excess of acid in the stomach? How can its effect be cured?
The salt which will give a neutral solution on dissolving in water will be:
(a) CH3COONa
(b) NH4Cl
(c) KCl
(d) Na2CO3
What is the difference between an alkali and a metal hydroxide?
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 | -- | -- | |
Match the pairs.
| Group A | Group B |
| 1. Tamarind | a. Acetic acid |
| 2. Curd | b. Citric acid |
| 3. Lemon | c. Tartaric acid |
| 4. Vinegar | d. Lactic acid |
What is the difference between : An alkali and a metal hydroxide?
Classify the various types of Acids based on their sources.
The correct way of making a solution of acid in water is to ______.
Write the important uses of hydrochloric acid and sulphuric acids.
