Three liquids are given to you. One is hydrochloric acid, another is
sodium hydroxide and third is a sugar solution. How will you identify
them? You have only turmeric indicator.
Explain why:
(a) An antacid tablet is taken when you suffer from acidity.
(b) Calamine solution is applied on the skin when an ant bites.
(c) Factory waste is neutralised before disposing it into the water
bodies.
Dorji has a few bottles of soft drink in his restaurant. But, unfortu-
nately, these are not labelled. He has to serve the drinks on the demand
of customers. One customer wants acidic drink, another wants basic
and third one wants neutral drink. How will Dorji decide which drink is
to be served to whom?
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and
form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic
and basic solutions. (T/F)
(v) Tooth decay is caused by the presence of a base. (T/F)
Name the source from which litmus solution is obtained. What is the
use of this solution?
Ammonia is found in many household products, such as window
cleaners. It turns red litmus blue. What is its nature?
If the height of a cylinder becomes1/4 of the original height and the
radius is doubled, then which of the following will be true?
(a) Total surface area of the cylinder will be doubled.
(b) Total surface area of the cylinder will remain unchanged.
(c) Total surface of the cylinder will be halved.
(d) None of the above
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