Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are
- Ared and blue
- Bblue and red
- Cpink and colourless
- ✓colourless and pink
Answer: D.
View full solution →Question types
Acids, Bases and Salts question types
104 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
104
Questions
9
Question groups
5
Question types
01
MCQ (1 Marks)
25 Q→02Assertion (A) & Reason (B) MCQ
5 Q→03True False[1 Marks ]
13 Q→04Fill In The Blanks With Correct Alternative.[1 Marks Each]
8 Q→051 Marks Question
20 Q→062 Marks Questions
21 Q→073 Marks Question
8 Q→08Match the Following.
3 Q→095 Marks Questions
1 Q→Sample Questions
Acids, Bases and Salts questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following is an acid-base indicator?
- AVinegar
- BLime water
- ✓Turmeric
- DBaking soda
Answer: C.
View full solution →Which of the following sets of substances contains acids only?
- AGrapes, lime water
- BVinegar, soap
- CCurd, milk of magnesia
- ✓Curd, vinegar
Answer: D.
View full solution →Anu re-visited a historical monument after 10 years. She noticed that the white monument had turned yellowish.
Which event is most likely to have caused the change in colour of the monument?
Which event is most likely to have caused the change in colour of the monument?
- AFlood
- BDrought
- ✓Acid rain
- DThunderstorm
Answer: C.
View full solution →A scientist tests a soil sample from a uncultivated field and concludes that the soil is highly basic in nature. She suggests that adding organic matter in the soil could improve the quality of the soil. How does organic matter improve the quality of the soil?
- ✓It releases acids which neutralises the soil
- BIt traps water vapour and increases the moisture content
- CIt makes the soil lighter so that it can be easily transported
- DIt acts as food for the organisms already present in the soil
Answer: A.
View full solution →The following questions consist of two statements-Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) When an acid is mixed with a base in any amount, the reaction is termed as neutralisation reaction.
Reason (R) The salt formed during neutralisation reaction can be acidic, basic or neutral.
Assertion (A) When an acid is mixed with a base in any amount, the reaction is termed as neutralisation reaction.
Reason (R) The salt formed during neutralisation reaction can be acidic, basic or neutral.
- 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 →The following questions consist of two statements-Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Turmeric stain on clothes turn red when it is washed with soap.
Reason (R) The soap solution is basic in nature.
Assertion (A) Turmeric stain on clothes turn red when it is washed with soap.
Reason (R) The soap solution is basic in nature.
- ✓Both 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.
- DA is false, but R is true.
Answer: A.
View full solution →The following questions consist of two statements-Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Sugar solution do not change the colour of blue or red litmus paper.
Reason (R) Neutral solution do not change the colour of either red or blue litmus paper.
Assertion (A) Sugar solution do not change the colour of blue or red litmus paper.
Reason (R) Neutral solution do not change the colour of either red or blue litmus paper.
- ✓Both 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.
- DA is false, but R is true.
Answer: A.
View full solution →The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) During neutralisation reaction, the reaction mixture becomes hot.
Reason (R) Dilute sulphuric acid when added to lime water (which is a base), releases heat energy.
Assertion (A) During neutralisation reaction, the reaction mixture becomes hot.
Reason (R) Dilute sulphuric acid when added to lime water (which is a base), releases heat energy.
- ✓Both 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.
- DA is false, but R is true.
Answer: A.
View full solution →The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Plants grow well when the soil is acidic.
Reason (R) Compost is added to the basic soil.
Assertion (A) Plants grow well when the soil is acidic.
Reason (R) Compost is added to the basic soil.
- 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 →Lime water turns red litmus to blue litmus.
All substances are either acidic or basic.
Phenolphthalein is a natural Indicator.
Common salt dissolved in water turns blue litmus to red litmus.
Lemon water is basic in nature.
Lemon juice and vinegar taste _________________ because they contain _________________
Turmeric and litmus are _________________ acid-base indicators.
Complete the following chemical reaction.
Acid + Base → X + Y
What does X and Y stand for?
X = _________________ Y = _________________
Acid + Base → X + Y
What does X and Y stand for?
X = _________________ Y = _________________
Phenolphthalein gives _________________ colour with lime water.
When an acidic solution is mixed with a basic solution, they _________________ each other forming _________________ and water.
Boojho added dilute sulphuric acid with lime water. Will the reaction mixture become hot or cool?
I am not getting the same result when using solid baking soda on dry litmus paper. Why?
Can I taste all substances to find their taste?
Form a sentence using the following words: baking soda, ant bite, moist, effect, neutralised, rubbing.
(i) Name one indicator which turns red on adding an acid.
(ii) Name one indicator which turns red on adding a base.
(ii) Name one indicator which turns red on adding a base.
Boojho, Paheli and their friend Golu were provided with a test, each containing China rose solution which was pink in colour. Boojho added 2 drops of solution 'A' in his test tube and got dark pink colour. Paheli added 2 drops of solution 'B' to her test tube and got green colour. Golu added 2 drops of solution 'C, but could not get any change in colour. Suggest the possible cause for the variation in their results.
You are provided with three test tubes A, B and C as shown in figure with different liquids.
What will you observe when you put
(i) a piece of blue litmus paper in each test tube?
(ii) a piece of red litmus paper in each test tube?
(iii) a few drops of phenolphthalein solution to each test tube?
What will you observe when you put
(i) a piece of blue litmus paper in each test tube?
(ii) a piece of red litmus paper in each test tube?
(iii) a few drops of phenolphthalein solution to each test tube?
Look at the given reaction.
Hydrochloric acid + Sodium hydroxide (base) → 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).
Hydrochloric acid + Sodium hydroxide (base) → 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).
Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the wastes of a factory in their village are flowing into the pond which probably caused the fish to die.
(i) Explain why the fish were dying?
(ii) If the factory waste is acidic in nature, how can it be neutralised?
(i) Explain why the fish were dying?
(ii) If the factory waste is acidic in nature, how can it be neutralised?
Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?
One day Rahul's mother after taking meal felt pain and irritation in her stomach at that time his father was out of station. Rahul remembered his teacher's statement and gave his mother some baking soda solution which gave her a relief from pain and irritation in stomach.
Read the above passage and answer the following questions
(i) Which information given by Rahul's teacher, that helped him to select the baking soda as remedy?
(ii) Why did he select baking soda as a cure?
(iii) What values are shown by Rahul?
Read the above passage and answer the following questions
(i) Which information given by Rahul's teacher, that helped him to select the baking soda as remedy?
(ii) Why did he select baking soda as a cure?
(iii) What values are shown by Rahul?
Using the knowledge of acids and bases, write a secret message with the help of lemon juice and China rose soluiton. Explain how it works?
Three test tubes A, B and C are taken as shown in figure below. Red litmus paper was dipped in all three test tubes to test which solution is basic in nature. Identify in which test tube the red litmus paper will change its colour to blue?
A student took some dilute hydrochloric acid in a flask, added a few drops of phenolphthalein and mixed it gently. After that the student added sodium hydroxide drop by drop to this colourless solution and continued until he saw some change in the colour of the solution.
(i) Name the type of reaction that the experiment demonstrates.
(ii) Complete the following word equation for the simple acid-base reaction that took place in the abvoe experiment.
Sodium hydroxide + Hydrochloric acid → _________________
(iii) Describe and explain the colour of the solution when sodium hydroxide was added.
(i) Name the type of reaction that the experiment demonstrates.
(ii) Complete the following word equation for the simple acid-base reaction that took place in the abvoe experiment.
Sodium hydroxide + Hydrochloric acid → _________________
(iii) Describe and explain the colour of the solution when sodium hydroxide was added.
Explain why
(a) an antacid tablet is taken when you suffer from acidity?
(b) calamine solution is applied on the skin, when an ant bites?
(c) factory waste is neutralised before disposing it into the water bodies?
(a) an antacid tablet is taken when you suffer from acidity?
(b) calamine solution is applied on the skin, when an ant bites?
(c) factory waste is neutralised before disposing it into the water bodies?
Match the Column I with Column II.
| Column I | Column II |
| A. Vinegar | 1. is used as indicator |
| B. Sodium chloride | 2. is sour to taste |
| C. Milk of magnesia | 3. major salt of sea |
| D. Turmeric | 4. changes red litmus blue |
| Column I | Column II |
| A. Tartaric acid | 1. Soap |
| B. Calcium hydroxide | 2. Curd |
| C. Formic acid | 3. Unripe mangoes |
| D. Sodium hydroxide | 4. Ant's sting |
| 5. Lime water |
| Column I | Column II |
| A. Lactic acid | 1. Harmful for crops, buildings |
| B. Acid rain | 2. Acidic |
| C. Aerated drink | 3. Indicator |
| D. Phenolphthalein | 4. Curd |
| 5. Salt |
Write any three applications of neutralisation reaction.
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