Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in the figure.
(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
Write a balanced chemical equation for the reaction taking place.
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AcademicChemistryNCERTClass 10

(i) Dry litmus paper        –   no action.
(ii) Moist litmus paper   –   becomes red.
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals Chapter End Questions Q9.1
[Extra information: 
Litmus is a natural indicator. A natural Indicator is a type of indicator that can be found naturally and can help us to know whether the material tested is an acidic substance or a basic substance. It is obtained from lichens. The process of obtaining a litmus solution needs the crushing and grinding of lichens.
Some examples of natural indicators other than litmus are:  red cabbage, turmeric, turnip skin, curry powder, etc.
Use:
It is used to test materials for acidity and basicity. This solution can also be used to differentiate between acids and bases. When acid is added to a litmus solution, it changes to red. When a base is added, it changes to blue. Neutral litmus paper is purple in colour.
]
raja
Updated on 10-Oct-2022 12:46:57

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