Name the source from which litmus solution is obtained what is the use of the solution

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Litmus solution: • Litmus is a combination of organic substances obtained from lichens such as Lecanora tartare and Rocella tinctotum. • Lichen is a composite creature that develops from a mutualistic connection between algae and cyanobacteria. • Litmus solution is made by dissolving a natural dye derived from lichens in distilled water. • The purpose of this solution is to distinguish between acids and bases. When we add acid to the litmus solution, it turns red, and when we add a base, it turns blue. Therefore, litmus solution is obtained from lichens and it is used in predicting the nature of the solution i.e. acid or base.

Punjab State Board PSEB Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts Science Guide for Class 7 PSEB Acids, Bases and Salts Intext Questions and Answers Think and Answer (Textbook Page No. 54) Question 1. What will be the colour of basic solution after the addition of pehnolphthalein? Answer: Adding phenolphthalein to the alkaline solution turns its colour to pink. Question 2. Name the products of neutralisation. Answer: In the process of neutralisation salt and water are produced in the form of products. PSEB 7th Class Science Guide Acids, Bases and Salts Textbook Questions and Answers 1. Fill in the blanks: (i) Acids are …………….. in taste. Answer: sour (ii) Litmus and turmeric extract are …………….. indicators. Answer: natural (iii) Phenolphthalein is ………………………… in acidic solution. Answer: pink (iv) Reaction between an acid and a …………………… is called neutralisation reaction. Answer: alkali (Base) (v) Ant’s sting has ………………….. acid. Answer: formic (vi) Excess secretion of hydrochloric acid in stomach, is called ……………………….. . Answer: indigestion (vii) Milk of magnesia is used in case of ……………………. . Answer: acidity 2. Match the Column ‘A’ with Column ‘B’: Column ‘A’ Column ‘B’ 1. Red litmus changes to blue in (a) Neutralisation 2. Blue litmus changes to red in (b) Zinc Carbonate 3. Reaction between acid and a base (c) Basic solution 4. Formic acid (d) Antbite 5. Calamine (e) Acidic Solution Answer: Column ‘A’ Column ‘B’ 1. Red litmus changes to blue in (c) Basic ...