Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb44f59b460d7261ec0e.jpg' /> The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a piece of blue litmus paper in test tube B?

Question 3 :
A compound if acidic will turn all indicators red. True or False?

Question 4 :
Common salt dissolved in water turns blue litmus red. True or False?

Question 5 :
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

Question 6 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb49f59b460d7261ec14.jpg' /> The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a few drops of phenolphthalein solution to test tube C?

Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4bf59b460d7261ec17.PNG' /> The above figure shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in test tube C? Nature of solution C is acidic.

Question 8 :
Calamine can be used to treat ant’s sting. True or False?

Question 9 :
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?

Question 12 :
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

Question 13 :
What is responsible for increase in temperature during a neutralisation reaction?

Question 15 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb46f59b460d7261ec10.jpg' /> The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a piece of red litmus paper in test tube A?

Question 19 :
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ___.