Which of the following is an acid-base indicator?
- AVinegar
- BLime water
- ✓Turmeric
- DBaking soda
Answer: C.
View full solution →Question types
Exploring Substances: Acidic, Basic, and Neutral question types
183 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
183
Questions
9
Question groups
5
Question types
01
MCQ (1 Marks)
30 Q→02Assertion (A) & Reason (B) MCQ
8 Q→03True False[1 Marks ]
14 Q→04Fill In The Blanks With Correct Alternative.[1 Marks Each]
12 Q→051 Marks Question
49 Q→062 Marks Questions
44 Q→073 Marks Question
13 Q→08Match the Following.
2 Q→095 Marks Questions
11 Q→Sample Questions
Exploring Substances: Acidic, Basic, and Neutral questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Sting of an ant contains
- Avinegar
- Bcommon salt
- ✓formic acid
- Dbaking soda.
Answer: C.
View full solution →Neutralisation reactions form
- Aan acid and a base
- Ban acid and a salt
- ✓a salt and water
- Da salt and a base.
Answer: C.
View full solution →Common salt is
- Aacidic
- Bbasic
- ✓neutral
- Dnone of these.
Answer: C.
View full solution →Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?
- AYellow in both acid and base
- ✓Yellow in acid and red in base
- CPink in acid and yellow in base
- DRed in acid and blue in base.
Answer: B.
View full solution →Assertion (A): Turmeric is a natural indicator.
Reason (R): Turmeric acquires an orange colour in basic solution.
Reason (R): Turmeric acquires an orange colour in basic solution.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- ✓A is true but R is false.
- DA is false but R is true.
Answer: C.
View full solution →Assertion (A): Sugar is a neutral substance.
Reason (R): A sugar solution turns red litmus blue.
Reason (R): A sugar solution turns red litmus blue.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- ✓A is true but R is false.
- DA is false but R is true.
Answer: C.
View full solution →Assertion (A): Neutralisation reaction is accompanied by the absorption of heat.
Reason (R): Neutralisation reaction is a reaction between an acid and a base to form salt and water.
Reason (R): Neutralisation reaction is a reaction between an acid and a base to form salt and water.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- ✓A is false but R is true.
Answer: D.
View full solution →Assertion (A): Adding lime to acidic soil helps plants grow.
Reason (R): Lime neutralises excess acid in the soil.
Reason (R): Lime neutralises excess acid in the soil.
- ✓Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
- BBoth Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
- C(A) is true, but (R) is false.
- D(A) is false, but (R) is true.
Answer: A.
View full solution →Assertion (A): Soap solution feels slippery.
Reason (R): It is acidic in nature.
Reason (R): It is acidic in nature.
- ABoth Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
- BBoth Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
- ✓(A) is true, but (R) is false.
- D(A) is false, but (R) is true.
Answer: C.
View full solution →Lime water turns red litmus blue.
Common salt dissolved in water turns blue litmus red.
Indicator is a substance which shows different colours in acidic and basic solutions.
All substances are either acidic or basic.
Acids are bitter in taste.
When an acidic solution is mixed with a basic solution, they ______ each other forming ______ and water.
Turmeric and litmus are ______ acid-base indicators.
Lemon juice and vinegar taste ______ because they contain ______ .
Lime water converts ______ litmus into ______ litmus.
The reaction between an acid and base is ______ called reaction.
Form a sentence using the following words - baking soda, ant bite, moist, effect, neutralised, rubbing.
A liquid sample from the laboratory was tested using various indicators :
| Indicator | Red litmus | Blue litmus | Turmeric |
| Change | No change | Turned red | No change in colour |
Which colour is given by the red rose extract in the basic solution?
A red litmus paper is dipped in a solution. The colour of litmus becomes blue. What is the nature of the solution?
Name the acids present in lemon and tamarind.
How can natural indicators be prepared? Explain by giving an example.
Keerthi wrote a secret message to her grandmother on her birthday using orange juice. Can you assist her grandmother in revealing the message? Which indicator would you use to make it visible?
Grape juice was mixed with red rose extract; the mixture got a tint of red colour. What will happen if baking soda is added to this mixture? Justify your answer.
Manya is blindfolded. She is given two unknown solutions to test and determine whether they are acidic or basic. Which indicator should Manya use to test the solutions and why?
The extract of red rose turns the liquid X to green. What will the nature of liquid X be? What will happen when excess of amla juice is added to liquid X?
Observe and analyse the information given in the following flowchart. Complete the missing information.
(Flowchart shows poor plant health due to soil condition)
(Flowchart shows poor plant health due to soil condition)
What is neutralisation? Give examples of neutralisation in daily life.
DIY Natural Indicator from Red Cabbage} Prepare a red cabbage extract and test the following substances: lemon juice, soap solution, toothpaste, vinegar and black tea.
(a) What colour does the red cabbage extract change to in each case?
(b) Based on your observations, how can you classify the substances as acidic or basic?
(a) What colour does the red cabbage extract change to in each case?
(b) Based on your observations, how can you classify the substances as acidic or basic?
| substance | Colour Change in Red Cabbage | Nature of the Substance |
| 1. Lemon Juice | ||
| 2. Soap Solution | ||
| 3. Toothpaste | ||
| 4. Vinegar | ||
| 5. Black tea |
Read the passage and answer the questions :
Keerthi tested various substances with red rose extract.
Q.1. Red rose extract turns green with:
(a) Vinegar$\quad$(b) Baking soda
(c) Lemon juice$\quad$(d) Sugar
Q.2. Which of the following would turn it red?
(a) Lime water$\quad$(b) Soap
(c) Amla juice$\quad$(d) Baking soda
Q.3. A solution that does not affect colour is:
(a) Vinegar$\quad$(b) Lime water
(c) Baking soda$\quad$(d) Soap
View full solution →Keerthi tested various substances with red rose extract.
Q.1. Red rose extract turns green with:
(a) Vinegar$\quad$(b) Baking soda
(c) Lemon juice$\quad$(d) Sugar
Q.2. Which of the following would turn it red?
(a) Lime water$\quad$(b) Soap
(c) Amla juice$\quad$(d) Baking soda
Q.3. A solution that does not affect colour is:
(a) Vinegar$\quad$(b) Lime water
(c) Baking soda$\quad$(d) Soap
| Column A | Column B |
| Q.1. Turmeric | A. Changes colour |
| Q.2. Acid + Base red rose | B. Natural indicator from |
| Q.3. Hydrangea flower substances | C. Becomes red in basic |
| Q.4. Red rose extract | D. Salt + Water + Heat |
| Column A | Column B |
| Q.1. Litmus | A. Bitter and slippery to touch |
| Q.2. Vinegar | B. Natural indicator from lichens |
| Q.3. Basc | C. Used to treat acidic soil |
| Q.4. Quick lime | D. Olfactory indicator |
| E. Acetic acid |
Could you suggest various materials which can be used for writing the message on the white sheet of paper (given at the beginning of the chapter) and what could be in the spray bottle? Make a table of various possible combinations and the colour of the writing obtained.
Table : Testing the nature of samples with blue and red litmus papers
| Name of the Sample | Colour of blue litmus paper after putting a drop of sample | Colour of red litmus paper after putting a drop of sample |
| Lemon juice | Red | Red |
| Soap solution | Blue | Blue |
| Amla juice | Red | Red |
| Tamarind water | Red | Red |
| Vinegar | Red | Red |
| Baking soda solution | Blue | Blue |
| Lime water | Blue | Blue |
| Tap water | Blue | Red |
| Washing powder solution | Blue | Blue |
| Sugar solution | Blue | Red |
| Salt solution | Blue | Red |
| Orange juice | Red | Red |
Observe and analyse the information given in the following flowchart. Complete the missing information.
Explain the neutralisation reaction using lemon juice and lime water.
How can you use onions as an olfactory indicator?
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