Question

What is the meaning of Latin word ‘acre`? Define acid with an example. 2. Ram’s father told we can prepare acids from soil. Write the name of such acids with examples? 3. What is indicator? 4. What is test for acid and bases using litmus paper? 5. Write two basic substances which we use in our daily life. 6. Write the name of natural indicators prepared from Rocella tinctoria and Gudhal. 7. Mention two synthetic indicators. Mention their color. 8. What name is given to those substances which do not change the color of either red or blue litmus paper? 9. Which acid is injected into our body by an ant sting that causes pain? 10. Which indicator shows dark pink with an acid? II. Short answer questions: 5x2=10M 1. You are provided with three test tubes 'A', ‘B', and ‘C` with different liquids – tamarind water, soap solution and pure water. What you will observe when you put a) A few drops of turmeric indicator in each test tube? b) A few drops of phenolphthalein indicator? c) A few drops of methyl orange indicator? 2. Rohit visited historical monument Tajmahal. He observed discoloration of marble. Explain briefly about discoloration of marble 3. Name three types of Salts. Give one example of each salt.​

Answer 1

Answer:

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