Question 1 :
When an acidic solution is mixed with a basic solution, they ___ each other forming ___ and water.

Question 2 :
‘Litmus’, a natural dye is an extract of which of the following?

Question 3 :
Name a natural indicator which gives pink colour in basic solution.

Question 4 :
Calamine can be used to treat ant’s sting. True or False?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb48f59b460d7261ec13.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 A?

Question 7 :
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 8 :
<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 10 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb43f59b460d7261ec0d.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 A?

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4ff59b460d7261ec19.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 D? Nature of solution D is neutral.

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 17 :
What is responsible for increase in temperature during a neutralisation reaction?

Question 18 :
Common salt dissolved in water turns blue litmus red. True or False?

Question 19 :
Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?