Question

13. Read the given paragraph carefully and answer the questions that follow. Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to the division Thallophyta, and is commonly used as an indicator. When the litmus solution is neither acidic nor basic, its colour is purple. There are many other natural materials like red cabbage leaves, turmeric, coloured petals of some flowers such as Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a solution. These are called acid-base indicators or sometimes simply indicators. a) Why are indicators used frequently in laboratories? How is litmus indicator obtained? b) An acidic and an alkaline solution is kept in two beakers A and B. How will you determine the nature of the solutions by using red and blue litmus papers? c) Why does the colour of curry stain change on dipping in soap solution? d) Which synthetic indicator can be used to detect the point when all molecules of HCl have been neutralized by NaOH during a neutralization reaction? Give the colour change.P

Answer 1

Answer:

a. indicators are used to indicate different types of solutions which comes between acid and bases..

Explanation:

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