Question

1. Name the acid present in ant sting and give its chemical formula. Also give
the common methods to get relief from the discomfort caused by the ant sting
2. What is universal indicator?
3. What is an acid-base indicators? Give two examples of synthetic aci-base
indicators.
4. What are olfactory indicators? Name two substances which can be used as
olfactory indicators?
5. What happened when NaOH solution is heated with a) Zinc b) Aluminium ?
6. A) what is the action of litmus on
a) Dry ammonia gas b) solution of ammonia gas in water.
B) State the observations on adding ammonium hydroxide to aqueous
solution of :i)Ferrous sulphate ii) Aluminium chloride.
7. Explain any five characteristics of bases.




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Answer 1

Answer:

2)A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.