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
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?
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.
Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.
Write balanced equation to satisfy the following statement:
\[\ce{Acid + sulphide -> Salt + Hydrogen sulphide}\]
You are supplied with five solutions: A, B, C, D and E with pH values as follows: A = 1.8, B = 7, C = 8.5, D = 13, and E = 5
Classify these solutions as neutral, slightly or strongly acidic and slightly or strongly alkaline.
Which solution would be most likely to liberate hydrogen with magnesium powder. Give a word equation for each reaction.
Which are the industrial uses of acids?
Explain, all alkalis are bases but all bases are not alkalis.
Write the balanced equations for the reaction required to convert insoluble lead (II) oxide into insoluble lead chloride.
In acidic solutions blue litmus changes into ______ colour.
