Question 1 :
‘Litmus’, a natural dye is an extract of which of the following?
Question 2 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb49f59b460d7261ec15.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 B?
Question 3 : <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 5 :
What is responsible for increase in temperature during a neutralisation reaction?
Question 7 :
What is the colour of blue litmus paper in lemon juice?
Question 8 : <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 10 : <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 11 :
Name a natural indicator which gives pink colour in basic solution.
Question 13 :
Name the solution which does not change the colour of either
red or blue litmus.
Question 14 : <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 16 :
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
Question 18 :
Common salt dissolved in water turns blue litmus red. True or False?
Question 23 :
Look at the given reaction. $Hydrochloric acid + Sodium hydroxide (base) \rightarrow Sodium chloride (salt) + Water$. Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from this solution? Suggest a method (if any).
Question 25 :
Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?
Question 26 : <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 27 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4af59b460d7261ec16.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 A? Nature of solution A is neutral.
Question 28 :
The correct way of making a solution of acid in water is to ___.
Question 30 :
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ___.
Question 31 : <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 32 :
Calamine can be used to treat ant’s sting. True or False?
Question 35 :
What is used to test whether a substance is acidic or basic?
Question 37 :
A solution changes the colour of turmeric indicator from yellow to red. The solution is ___.
Question 38 : <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 40 :
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 41 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb46f59b460d7261ec11.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 B?
Question 43 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb45f59b460d7261ec0f.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 C?
Question 44 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4ef59b460d7261ec18.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 B? Nature of solution B is basic.
Question 46 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb47f59b460d7261ec12.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 C?
Question 47 :
When an acidic solution is mixed with a basic solution, they ___ each other forming ___ and water.
Question 48 :
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?
Question 49 :
A compound if acidic will turn all indicators red. True or False?
