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प्रश्न
Heshna and Keerthi are friends. Keerthi’s teeth are white without caries, but Heshna has teeth with caries. Why? How is it formed?
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.
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संबंधित प्रश्न
What type of ions is formed when an acid is dissolved in water?
One of the following salts will give an alkaline solution on dissolving in water. This is:
a) Na2CO3
(b) Na2SO4
(c) NaCl
(d) (NH4)2 SO4
Write chemical names from given formulae.
H2SO4
Give four examples of preparation of acids by synthesis.
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) Temperature of the solution decreases.
(ii) Temperature of the solution increases.
(iii) Temperature of the solution remains the same.
(iv) Salt formation takes place.
Citric acid is present in ______.
An acid is ______.
Which of the following metal does not react with sodium hydroxides?
Complete the following equation.
HCl + H2O → ______ + ______.
Draw the structure of Hydronium ion.
