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

Name the source from which litmus solution is obtained. What is the use of this solution? Answer: Litmus solution is obtained from lichens . A natural dye extracted from lichens is dissolved in distilled water to obtain litmus solution. It is used as an indicator to distinguish between acids and bases . • If the medium is acidic , litmus changes its colour to red . • If the medium is basic , litmus changes its colour to blue . • If the medium is neutral , there is no change in the colour.

NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts NCERT Solutions for CBSE Class 7 Science Chapter 5 Acids, Bases and Salts are given below. These solutions help students to clear their doubts and to obtain good marks in final exam. Class 7 Science NCERT questions and answers provided in this article are strictly based on the CBSE syllabus and curriculum. Class 7 Science Chapter 5 Acids, Bases and Salts NCERT Solutions EXERCISES Question 1: State differences between acids and bases. Answer: Acids Bases Acids are sour in taste Bases are bitter in taste Acids turn blue litmus paper into red colour The base does not change the colour of blue litmus paper Acids does not change the colour of the red litmus Bases turn red litmus paper to blue colour Acids do not change the colour of turmeric indicator. Bases turn the colour of turmeric indicator to red. With china rose indicator, these give dark pink colour. Bases give green colour with china rose indicator. Question 2: Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? Answer: Bases turn red litmus blue, so nature of ammonia is basic. Question 3: Name the source from which litmus solution is obtained. What is the use of this solution? Answer: Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test ...

Answer Litmus solution is obtained from the lichens. It haspurple colour in distilled water. It is found as two types: Red litmus and Blue litmus paper. When we add it in the acidic solution, it turns blue litmus to red. And, when we add it in the basic solution, it turns into the blue. Litmus is available in the form of strips of paper, known as litmus paper. Popular Questions of Class 7 Science • Q:- Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f ) Digestion of food • Q:- Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words. DownAcross (D) 1 : Thorough washing(A) 1 : Keeps warm 2 : Animal fibre 2 : Its leaves are eaten by silkworms 3 : Long thread like structure 3 : Hatches from egg of moth • Q:- Sketch the cross section of soil and label the various layers. • Q:- Take three test-tubes. Fill æth of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO 2? • Q:- Here is a crossword puzzle: Good luck! Across 3. Liquid waste products 4. Solid waste extracted in sewage treatment 6. A word related to hygiene 8. Waste matter discharged from human body Down 1. Used water 2. A pipe carrying...

Hint: We know that litmus is obtained from a mixture of dyes. Try to figure out the source of these dyes. We know that litmus is used in many chemical reactions. Chemical reactions involving acids and bases use this litmus for identifying equivalence points. Complete step by step answer: We know that litmus is an organic compound prepared from a mixture of dyes which are extracted from lichens, cellulose compounds, and some other organic compounds. Impurities are removed from the litmus solution to prepare litmus paper. Litmus preparation requires several varieties of lichens. Cellulose treated with some solvents is used in the preparation of litmus paper. Litmus paper preparation is almost similar to the normal preparation but this litmus paper is infused with lichens. We use litmus paper to test whether a substance is acidic or basic or neutral. For testing solutions whether it is acid or base, we need two colors of litmus papers. Blue litmus turns to red in the presence of acidic solution. Red litmus turns to blue in the presence of a basic solution. Both litmuses turn to purple in the presence of a neutral solution. Litmus has 2 different structures in acidic and basic solutions.

NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts are part of NCERT Solutions for Class 7 Science. Here we have given NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts. Board CBSE Textbook NCERT Class Class 7 Subject Science Chapter Chapter 5 Chapter Name Acids, Bases and Salts Number of Questions Solved 11 Category NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts Question 1. State differences between acids and bases. Solution: S. No Acids Bases (i) Acids are sour to taste. Bases are bitter to taste. (ii) Acid turns blue litmus to red. Base turns red litmus to blue. (iii) Acid is a substance which contains Bases are substances which contain (iv) hydrogen ion (H +). hydroxyl ion (OH –) Question 2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? Solution: Basic. Question 3. Name the source from which litmus solution is obtained. What is the use of this solution? Solution: The extraction of litmus solution takes place from Lichens (a symbiotic association of algae and fungi). It is used to determine whether the given solution is acidic or basic. Question 4. Is the distilled water acidic/basic/neutral? How would you verify it? Solution: The nature of distilled water can be verified with the help of red and blue litmus paper. It shows no change with both kinds of litmus paper, so distilled water is neutral. Question 5. Describe the process of neutralizat...