We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 5 Acids, Bases and Salts with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Acids, Bases and Salts Class 7 MCQs Questions with Answers here along with a detailed explanation.
Acids, Bases and Salts Class 7 MCQs Questions with Answers
Choose the correct option.
Question 1.
Acids taste
(a) sour
(b) sweet
(c) bitter
(d) salty
Answer
Answer: (a) sour
Question 2.
Bases taste
(a) sweet
(b) sour
(c) bitter
(d) salty
Answer
Answer: (c) bitter
Question 3.
Colours of phenolphthalein indicator in acidic and basic medium, respectively are
(a) pink and colourless
(b) colourless and pink
(c) blue and red
(d) red and blue
Answer
Answer: (b) colourless and pink
Question 4.
The nature of bases is
(a) acidic
(b) basic
(c) neutral
(d) all of these
Answer
Answer: (b) basic
Question 5.
Which of the following feel soapy on touching?
(a) Acid
(b) Base
(c) Salt
(d) None of these
Answer
Answer: (b) Base
Question 6.
Which of the following is a natural indicator?
(a) China rose petal
(b) Turmeric
(c) Litmus
(d) All of these
Answer
Answer: (d) All of these
Question 7.
The most commonly used natural indicator is
(a) turmeric
(b) beetroot
(c) China rose petal
(d) litmus
Answer
Answer: (d) litmus
Question 8.
The correct way of making a solution of acid in water is to
(a) add water to acid
(b) add acid to water
(c) mix acid and water simultaneously
(d) add water to acid in a shallow container
Answer
Answer: (b) add acid to water
Question 9.
Which of the following is basic in nature?
(a) Lime water
(b) Baking soda
(c) Both (a) and (b)
(d) Lemon juice
Answer
Answer: (c) Both (a) and (b)
Question 10.
Litmus is extracted from
(a) curd
(b) grapes
(c) lichens
(d) cabbage
Answer
Answer: (c) lichens
Question 11.
Calcium hydroxide is found in
(a) window cleaner
(b) lime water
(c) soap
(d) lime juice
Answer
Answer: (b) lime water
Question 12.
On adding phenolphthalein indicator to a colourless solution, no change is observed. The nature of the solution may be
(a) acidic or basic
(b) basic
(c) acidic or neutral
(d) basic or neutral
Answer
Answer: (c) acidic or neutral
Question 13.
Neutralisation reactioñ is a
(a) physical and reversible change
(b) physical and irreversible change
(c) chemical and reversible change
(d) chemical and irreversible change
Answer
Answer: (d) chemical and irreversible change
Question 14.
When a drop of vinegar solution is put on the litmus paper, it turns
(a) red
(b) blue
(c) green
(d) yellow
Answer
Answer: (a) red
Question 15.
Tap water is
(a) acidic
(b) basic
(c) neutral
(d) depends on source
Answer
Answer: (d) depends on source
Question 16.
When phenolphthalein is added to a acidic solution, it gives
(a) pink colour
(b) red colour
(c) blue colour
(d) no colour
Answer
Answer: (d) no colour
Question 17.
A neutralisation reaction gives
(a) salt and water
(b) acid and salt
(c) base and salt
(d) acid and base
Answer
Answer: (a) salt and water
Question 18.
Our stomach contains
(a) hydrochloric acid
(b) sodium hydroxide
(c) sulphuric acid
(d) nitric acid
Answer
Answer: (a) hydrochloric acid
Question 19.
When we suffer from acidity, we should take
(a) iron tonic
(b) vitamins
(c) antacid
(d) lactocalamine
Answer
Answer: (c) antacid
Question 20.
When an ant bites, it injects
(a) acidic liquid
(b) basic liquid
(c) both (a) and (b)
(d) neutral liquids
Answer
Answer: (a) acidic liquid
Question 21.
Substances that have sour taste and turn blue litmus red are called
(a) acids
(b) bases
(c) salts
(d) water
Answer
Answer: (a) acids
Question 22.
Acid used in eye wash is
(a) carbonic acid
(b) acetic acid
(c) benzoic acid
(d) boric acid
Answer
Answer: (d) boric acid
Question 23.
Acid which is used as a source of vitamin C is
(a) citric acid
(b) carbonic acid
(c) boric acid
(d) tartaric acid
Answer
Answer: (a) citric acid
Question 24.
A base which is used for removing grease and stains from woollen clothes is
(a) ammonium hydroxide
(b) magnesium hydroxide
(c) sodium hydroxide
(d) calcium hydroxide
Answer
Answer: (a) ammonium hydroxide
Question 25.
Neutralisation is a reaction between
(a) two acids
(b) two bases
(c) one acid and one base
(d) one acid and one neutral substance
Answer
Answer: (c) one acid and one base
Question 26.
Sting of an ant contains
(a) vinegar
(b) common salt
(c) formic acid
(d) milk of magnesia
Answer
Answer: (c) formic acid
Question 27.
Lime water turns
(a) red litmus into blue
(b) blue litmus to red
(c) no change
(d) can’t predict
Answer
Answer: (a) red litmus into blue
Question 28.
Common salt is
(a) acidic
(b) basic
(c) neutral
(d) none of these
Answer
Answer: (c) neutral
Question 29.
Milk of magnesia is used as antacid because
(a) it is acidic
(b) it is basic
(c) it is neutral
(d) all of above
Answer
Answer: (b) it is basic
Question 30.
Colour of phenolphthalein in acidic solution is
(a) colourless
(b) pink
(c) yellow
(d) orange
Answer
Answer: (a) colourless
Question 31.
Process in which acids and bases react to form salt and water is called
(a) neutralisation
(b) hydrogenation
(c) sublimation
(d) all of these
Answer
Answer: (a) neutralisation
Fill in the blanks with suitable word/s.
Question 1.
…………….. can cause damage to historical monuments, marble, statues, plants and animals.
Answer
Answer: Acid rain
Question 2.
…………….. helps to relieve indigestion.
Answer
Answer: Antacid
Question 3.
Organic matters release ……………..
Answer
Answer: acids
Question 4.
Salt may be …………….., …………….. or …………….. in nature.
Answer
Answer: acidic, basic, neutral
Question 5.
Plants do not grow well when the soil is either too …………….. or too ……………..
Answer
Answer: acidic, basic
Question 6.
When an ant bites, it injects …………….. acid.
Answer
Answer: formic
Question 7.
Detergent solution is …………….. substance.
Answer
Answer: basic
Question 8.
Chemical name of chuna is ……………..
Answer
Answer: calcium oxide
Question 9.
Phenolphthalein is a …………….. indicator.
Answer
Answer: man-made
Question 10.
The word acid comes from the Latin word …………….. which means ……………..
Answer
Answer: acere, sour
Question 11.
Citrus fruits contain …………….. acid.
Answer
Answer: citric
Question 12.
Milk of magnesia helps to …………….. food.
Answer
Answer: digest
Question 13.
China rose turns acidic solution …………….. and basic solution ……………..
Answer
Answer: dark pink, green
Question 14.
Spinach contains …………….. acid.
Answer
Answer: oxalic
Question 15.
Sugar is …………….. in nature.
Answer
Answer: neutral
Question 16.
are used to identify the nature of substances.
Answer
Answer: Indicators
Question 17.
Bases are to taste.
Answer
Answer: bitter
Question 18.
Acids are to taste.
Answer
Answer: sour
Question 19.
Antacid tablets contain which neutralise the excess acid formed in our body.
Answer
Answer: base
Question 20.
is the reaction between acid and base to form salt and water.
Answer
Answer: Neutralisation
Question 21.
If China rose indicator is added to a basic solution, it turns .
Answer
Answer: green
Question 22.
Lime water is in nature.
Answer
Answer: basic
True or False
Question 1.
Curd is a base.
Answer
Answer: False
Question 2.
Lime juice tastes sour.
Answer
Answer: True
Question 3.
Turmeric is a man-made indicator.
Answer
Answer: False
Question 4.
China rose petal is a natural indicator.
Answer
Answer: True
Question 5.
Litmus is called a natural dye.
Answer
Answer: True
Question 6.
Lactic acid is found in lemons.
Answer
Answer: False
Question 7.
Sodium/Potassium hydroxide is found in soap.
Answer
Answer: True
Question 8.
Litmus paper is available as red and yellow colour.
Answer
Answer: False
Question 9.
Litmus paper turns an acidic solution red and basic solution blue.
Answer
Answer: True
Question 10.
When added to a basic solution, phenolphthalein gives pink colour.
Answer
Answer: True
Question 11.
When the soil is too acidic, it is treated with bases like quick lime.
Answer
Answer: True
Question 12.
Organic matter releases acids.
Answer
Answer: True
Question 13.
A salt is formed when an acid and a base neutralise each other.
Answer
Answer: True
Question 14.
Acids turn blue litmus red.
Answer
Answer: True
Question 15.
Bases turn red litmus green.
Answer
Answer: False
Question 16.
Indicators bring about colour change in colour of a substance.
Answer
Answer: True
Question 17.
Soluble bases are known as alkali.
Answer
Answer: True
Question 18.
Phenolphthalein gives pink colour with acids.
Answer
Answer: False
Question 19.
Solutions which do not change the colour of an indicator are known as acidic solutions.
Answer
Answer: False
Question 20.
Turmeric contains a natural dye of yellow colour.
Answer
Answer: True
Question 21.
Acids produce hydroxide ions when dissolved in water.
Answer
Answer: False
Question 22.
Acids are bitter in taste.
Answer
Answer: False
Question 23.
Sting of an ant contains vinegar.
Answer
Answer: False
Match the Following
| Column I | Column II |
| 1. Tartaric acid | (a) Soap |
| 2. Calcium hydroxide | (b) Oranges |
| 3. Formic acid | (c) Vinegar |
| 4. Citric acid | (d) Lime water |
| 5. Lactic acid | (e) Tamarind |
| 6. Sodium hydroxide | (f) Window cleaner |
| 7. Oxalic acid | (g) Milk of magnesia |
| 8. Ammonium hydroxide | (h) Curd |
| 9. Acetic acid | (i) Ant’s sting |
| 10. Magnesium hydroxide | (j) Spinach |
Answer
Answer:
| Column I | Column II |
| 1. Tartaric acid | (e) Tamarind |
| 2. Calcium hydroxide | (d) Lime water |
| 3. Formic acid | (i) Ant’s sting |
| 4. Citric acid | (b) Oranges |
| 5. Lactic acid | (h) Curd |
| 6. Sodium hydroxide | (a) Soap |
| 7. Oxalic acid | (j) Spinach |
| 8. Ammonium hydroxide | (f) Window cleaner |
| 9. Acetic acid | (c) Vinegar |
| 10. Magnesium hydroxide | (g) Milk of magnesia |
| Column A | Column B |
| 1. Vinegar | (a) Salt |
| 2. Fertiliser | (b) Basic |
| 3. Sodium chloride | (c) Magnesium hydroxide |
| 4. Lime water | (d) Acetic acid |
| 5. Milk of magnesia | (e) Potassium nitrate |
Answer
Answer:
| Column A | Column B |
| 1. Vinegar | (d) Acetic acid |
| 2. Fertiliser | (e) Potassium nitrate |
| 3. Sodium chloride | (a) Salt |
| 4. Lime water | (b) Basic |
| 5. Milk of magnesia | (c) Magnesium hydroxide |
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