Here we are providing Class 7 Science Objective Chapter – 5 Acids, Bases and Salts because its very important for Class 6 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 7 Science Objective Chapter – 5 Acids, Bases and Salts is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 7 Science Objective Chapter – 5 Acids, Bases and Salts 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 7 Science Objective Chapter – 5 Acids, Bases and Salts
1.Acids taste
( A ) sour
( B ) sweet
( C ) bitter
( D ) salty
Ans – ( A )
2.. Mohan Appeared In Class Test Where He Wrote Some Statements About Acids, But He Confused To Know The Correct Statement. Would You Help Him To Know That?
( A ) They have a sour taste.
( B ) They are corrosive in nature if it falls on the skin, it can cause burns.
( C ) They are good conductors of electricity, as they allow the passage of electric current through them.
( D ) All the above.
Ans – ( D )
3.When CO2 gas is passed through limewater, it turns milky. Which of the following compounds is responsible for this milkiness ?
( A ) Calcium oxide
( B ) Calcium chloride
( C ) sodium carbonate
( D ) Calcium carbonate
Ans – ( D )
4.Bases taste
( A ) sweet
( B ) sour
( C ) bitter
( D ) salty
Ans – ( C )
5.Which of the following ion is responsible for the acidic nature of hydrochloric acid ?
( A ) Hydrogen ion
( B ) Hydroxide ion
( C ) Chloride ion
( D ) Hydrochloride ion
Ans – ( A )
6.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
Ans – ( B )
7.Distilled water is:
( A ) acidic
( B ) basic
( C ) neutral
( D ) none of these
Ans – ( C )
8.The nature of bases is
( A ) acidic
( B ) basic
( C ) neutral
( D ) all of these
Ans – ( B )
9.Ammonia that turns red litmus blue is:
( A ) acidic
( B ) basic
( C ) neutral
( D ) none of these
Ans – ( B )
10.Which of the following feel soapy on touching?
( A ) Acid
( B ) Base
( C ) Salt
( D ) None of these
Ans – ( B )
11.An antacid tablet is given to a person when he suffers from:
( A ) obesity
( B ) acidity
( C ) dog bite
( D ) none of these
Ans – ( B )
12.Which of the following is a natural indicator?
( A ) China rose petal
( B ) Turmeric
( C ) Litmus
( D ) All of these
Ans – ( D )
13.Ant’s bite injects:
( A ) acetic acid
( B ) formic acid
( C ) hydrochloric acid
( D ) none of these
Ans – ( B )
14.The most commonly used natural indicator is
( A ) turmeric
( B ) beetroot
( C ) China rose petal
( D ) litmus
Ans – ( D )
16.The acid that our stomach releases is:
( A ) sulphuric acid
( B ) nitric acid
( C ) hydrochloric acid
( D ) formic acid
Ans – ( C )
17.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
Ans – ( B )
18.Neutralisation reaction is the reaction between:
( A ) acid and base
( B ) salt and water
( C ) base and salt
( D ) acid and salt
Ans – ( A )
19.Which of the following is basic in nature?
( A ) Lime water
( B ) Baking soda
( C ) Both ( A ) and (b)
( D ) Lemon juice
Ans – ( C )
20.When the soil is too acidic, it is treated with:
( A ) salt
( B ) water
( C ) base
( D ) acid
Ans – ( C )
21.Litmus is extracted from
( A ) curd
( B ) grapes
( C ) lichens
( D ) cabbage
Ans – ( C )
22.Quick lime is used in soil when the soil is:
( A ) basic
( B ) acidic
( C ) salty
( D ) neutral
Ans – ( B )
23.Calcium hydroxide is found in
( A ) window cleaner
( B ) lime water
( C ) soap
( D ) lime juice
Ans – ( B )
24.If the soil is too basic, it is treated with:
( A ) quicklime
( B ) salt
( C ) organic matter
( D ) water
Ans – ( C )
25.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
Ans – ( C )
26.The factory waste are neutralised by adding:
( A ) acidic substances
( B ) salts
( C ) basic substances
( D ) water
Ans – ( C )
27.Neutralisation reactioñ is a
( A ) physical and reversible change
( B ) physical and irreversible change
( C ) chemical and reversible change
( D ) chemical and irreversible change
Ans – ( D )
28.Soap is:
( A ) acidic
( B ) basic
( C ) neutral
( D ) salt
Ans – ( B )
29.When a drop of vinegar solution is put on the litmus paper, it turns
( A ) red
( B ) blue
( C ) green
( D ) yellow
Ans – ( A )
30.Litmus is a natural indicator which is extracted from:
( A ) vinegar
( B ) citrus fruits
( C ) lichens
( D ) spinach
Ans – ( C )
31.Tap water is
( A ) acidic
( B ) basic
( C ) neutral
( D ) depends on source
Ans – ( D )
32.The colour of litmus in distilled water is:
( A ) red
( B ) green
( C ) blue
( D ) purple
Ans – ( D )
33.When phenolphthalein is added to a acidic solution, it gives
( A ) pink colour
( B ) red colour
( C ) blue colour
( D ) no colour
Ans – ( D )
34.Tartaric acid is found in:
( A ) vinegar
( B ) curd
( C ) amla
( D ) tamarind
Ans – ( A )
35.A neutralisation reaction gives
( A ) salt and water
( B ) acid and salt
( C ) base and salt
( D ) acid and base
Ans – ( A )
36.Calcium hydroxide is found in:
( A ) soap
( B ) lime water
( C ) vinegar
( D ) milk of magnesia
Ans – ( B )
37.Our stomach contains
( A ) hydrochloric acid
( B ) sodium hydroxide
( C ) sulphuric acid
( D ) nitric acid
Ans – ( A )
38.Citric acid is found in:
( A ) fruits
( B ) vegetables
( C ) citrus fruits
( D ) all of these
Ans – ( C )
39.When we suffer from acidity, we should take
( A ) iron tonic
( B ) vitamins
( C ) antacid
( D ) lactocalamine
Ans – ( C )
40.Blue litmus paper is dipped in a solution. It remains blue. What is the nature of solution ?
( A ) Acid and base
( B ) Base and neutral
( C ) Acid apd neutral
( D ) None of these
Ans – ( B )
41.An oxide is acidic and has a pungent odour. It could be
( A ) sulphur dioxide
( B ) carbon dioxide
( C ) sodium oxide
( D ) nitrogen dioxide
Ans – ( D )
42.When an ant bites, it injects
( A ) acidic liquid
( B ) basic liquid
( C ) both ( A ) and (b)
( D ) neutral liquids
Ans – ( A )
43.Out of these gases which one is used in fire extinguishers
( A ) CO2
( B ) SO2
( C ) NO2
( D ) H2S
Ans – ( A )
44.Substances that have sour taste and turn blue litmus red are called
( A ) acids
( B ) bases
( C ) salts
( D ) water
Ans – ( A )
45.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
Ans – ( B )
46.Acid used in eye wash is
( A ) carbonic acid
( B ) acetic acid
( C ) benzoic acid
( D ) boric acid
Ans – ( D )
47.Products of a neutralisation reaction are always:
( A ) an acid and a base
( B ) an acid and a salt
( C ) a salt and water
( D ) a salt and a base
Ans – ( C )
48.Acid which is used as a source of vitamin C is
( A ) citric acid
( B ) carbonic acid
( C ) boric acid
( D ) tartaric acid
Ans – ( A )
49.Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.
( A ) Yellow in both acid and base
( B ) Yellow in acid and red in base
( C ) Pink in acid and yellow in base
( D ) Red in acid and blue in base
Ans – ( B )
50.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
Ans – ( A )
51.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
Ans – ( D )
52.Neutralisation is a reaction between
( A ) two acids
( B ) two bases
( C ) one acid and one base
( D ) one acid and one neutral substance
Ans – ( D )
53.When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
( A ) Organic matter
( B ) Quick lime
( C ) Slaked lime
( D ) Calamine solution
Ans – ( A )
54.Sting of an ant contains
( A ) vinegar
( B ) common salt
( C ) formic acid
( D ) milk of magnesia
Ans – ( C )
55.Which of the following set of substances contain acids?
( A ) Grapes, lime water
( B ) Vinegar, soap
( C ) Curd, milk of magnesia
( D ) Curd, vinegar
Ans – ( D )
56.Lime water turns
( A ) red litmus into blue
( B ) blue litmus to red
( C ) no change
( D ) can’t predict
Ans – ( A )
57.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
Ans – ( C )
58.Common salt is
( A ) acidic
( B ) basic
( C ) neutral
( D ) none of these
Ans – ( C )
59.Which of the following is an acid-base indicator?
( A ) Vinegar
( B ) Lime water
( C ) Turmeric
( D ) Baking soda
Ans – ( C )
60.Milk of magnesia is used as antacid because
( A ) it is acidic
( B ) it is basic
( C ) it is neutral
( D ) all of above
Ans – ( B )
61. Which Of The Following Statement(S) Is Or Are incorrect ?
( A ) Lemon water is basic in nature.
( B ) A compound if acidic will turn all indicators red.
( C ) Common salt dissolved in water turns blue litmus red.
( D ) All of the above.
Ans – ( D )
62.Colour of phenolphthalein in acidic solution is
( A ) colourless
( B ) pink
( C ) yellow
( D ) orange
Ans – ( A )
63. Boojho Wants To Know Different Colours In Different Solutions With The Help Of Red Litmus Paper. Consider The Following Sentences And Choose The Correct One And Help Him:
( A ) Milk in water shows no change.
( B ) Baking powder in water turns blue.
( C ) Blue vinegar in water source no change.
( D ) All the above.
Ans – ( A )
64.Process in which acids and bases react to form salt and water is called
( A ) neutralisation
( B ) hydrogenation
( C ) sublimation
( D ) all of these
Ans – ( A )
65. Boojho Is Writing Some Statements, Choose The Correct Statement And Help Him:
( A ) Heat is responsible for increase in temperature during a neutralization reaction.
( B ) Turmeric is a natural indicator and gives pink colour in basic solution.
( C ) Acids are good conductors of electricity; as they allow the passage of electric current through them.
( D ) All the above.
Ans – ( D )