Question

a) Write the name given to bases that are highly soluble in water. Give an example.
(b) How is tooth decay related to pH ? How can it be prevented ?
(c) Why does bee-sting cause pain and irritation ? Rubbing of baking soda on the sting area gives relief. How ?

CBSE Class X Science SA 2 (3 Marks)

Answer 1

a) alkalis. Eg: kOH,NaOH b) Tooth decay is caused when pH of mouth is low than 5.5 . It can be prevented by using tooth paste which will neutralise the effect of the acid. c) Bee string causes pain and irritation due to formation of acid.Rubbing of baking soda neutralises the effect of acid as baking soda is basic in nature.

Answer 2

a) alkali

b) due to acid. I can be prevented by using Colgate, dabur red paste , etc..

c) methanoic acidbakinsoda is a an antacid

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