Phenolphthalein

Q. Phenolphthalein gives pink colour only with acids and remains colourless in basic solution.

1. False
2. True

Q.

What will happen if a drop of phenolphthalein is added to an acid

Q.

define phenolphthalein and what colour it gives ?

Q.

What is natural and artificial indicator? Give some examples.

Q. On adding phenolphthalein indicator to a colourless solution, no change is observed. What can be the nature of this solution?

1. Alkaline.
2. Acidic and neutral.
3. Acidic and alkaline.
4. None of these

Q.

When phenolphthalein is added to an acidic solution, it gives

1. 
   

   Pink colour

2. Red colour
3. 
   

   Blue colour

4. 
   

   No colour

Q. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?

1. Baking powder
2. Lime
3. Ammonium hydroxide
4. Hydrochloric acid

Q.

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are

1. 
   

   red and blue

2. blue and red
3. 
   

   pink and colourless

4. 
   

   colourless and pink

Q.

Phenolphthalein is a synthetic indicator.

1. True
2. False

Q.

When phenolphthalein is added to an acidic solution, it gives

1. 
   

   Pink colour

2. Red colour
3. 
   

   Blue colour

4. 
   

   No colour

Q.

Question 4

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink

Q.

What is phenolphthalein?

Q. Assertion :Phenolphthalein is used as indicator during the titration of oxalic acid against sodium hydroxide. Reason: $pH$ range of phenolphthalein is from $8$ to $9.6$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Phenolpthalein is ____________ type of indicator.

1. Natural indicator
2. Synthetic indicator
3. Universal indicator
4. None of the above

Q. Ram was given a jar filled with distilled water. What would be his observation when he adds a drop of phenolphthalein in this jar?

1. Water turns red in colour
2. Water turns blue in colour
3. Water remains colourless
4. Water turns pink in colour

Q. Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are:

1. red and blue
2. blue and red
3. pink and colorless
4. colorless and pink

Q. Write the name of two artificial indicators.

Q.

Question 10

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
(a) Basic
(b) Either acidic or basic
(c) Either acidic or neutral
(d) Either basic or neutral

Q.

Define an indicator

Q. What is the colour of phenolphthalein in soap solution?

1. Red
2. Blue
3. Yellow
4. Pink

Q.

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are

1. 
   

   red and blue

2. blue and red
3. 
   

   pink and colourless

4. 
   

   colourless and pink

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

1. Either basic or neutral
2. Basic
3. Either acidic or basic
4. Either acidic or neutral