Acids, Bases and Salts Class 10 MCQ

Class 10 Science Chapter 2 MCQ Acids, Bases and Salts

MCQ on Acids, Bases and Salts Class 10

Select and write the most appropriate option of the four options for each of the questions :

Question 1.
With the increase in the concentration of hydrogen ions, the pH value will ( )
A) Increase
B) Decrease
C) Remain constant
D) Remain fluctuation
Answer:
B) Decrease

Question 2.
The colour of pH paper strip at the pH valued of 1.7 and 14 will be
A) Green, red and blue
B) Red, green and blue
C) Blue, green and red
D) Green, blue and red
Answer:
B) Red, green and blue

Question 3.
Which of the following is a strong acid ?
A) Ethanoic acid
B) Citric acid
C) Tartaric acid
D) Sulphuric acid
Answer:
D) Sulphuric acid

Question 4.
Which of the following weak acid ?
A) Ethanoic acid
B) Nitric acid
C) Sulphuric acid
D) Hydrochloric acid
Answer:
A) Ethanoic acid

Question 5.
Which of the following is a mineral acid ?
A) Citric acid
B) Lactic acid
C) Oxalic acid
D) Nitric acid
Answer:
D) Nitric acid

Question 6.
Which of the following contains oxalic acid ?
A) Sour milk
B) Orange
C) Tomato
D) Tamarind
Answer:
D) Tamarind

Question 7.
The compound which is used in glass, soap and paper industries is :
A) Washing soda
B) Baking soda
C) Lime water
D) Bleaching powder
Answer:
A) Washing soda

Question 8.
The formula of Gypsum and Plaster of Paris is
A) CaSO₄ . 2 H₂O and CaSO₄ \(\frac{1}{2}\) H₂O
B) CaSO₄ . 2 H₂O and CaSO₄ \(\frac{1}{2}\)H₂O
C) CaSO₄ and CaSO₄ \(\frac{1}{2}\)H₂O
D) CaSO₄, 2 H₂O and CaSO₄ . 3 H₂O
Answer:
B) CaSO₄ . 2 H₂O and CaSO₄ \(\frac{1}{2}\)H₂O

Question 9.
The compound which is used as on oxidising agent in many chemical industries is
A) Bleaching powder
B) Washing powder
C) Baking powder
D) Quick lime
Answer:
A) Bleaching powder

Question 10.
The compound which is used for removing permanent hardness of water is ( )
A) NaHCO₃
B) CuSO₄ 5H₂O
C) Na₂ CO₃
D) Na₂ CO₃ . 10 H₂O
Answer:
D) Na₂ CO₃ . 10 H₂O

Question 11.
Common salt besides being used in kitchen can also be used as the raw material for making
i) washing soda
ii) bleaching powder
iii) baking soda
iv) slaked lime
A) (i) and (ii)
B) (i), (ii) and (iv)
C) (i) and (iii)
D) (i), (iii) and (iv)
Answer:
C) (i) and (iii)

Question 12.
Which of the following are present in a dilute aqueous solution of Hydrochloric acid?
A) H₂O⁺+Cl^–
B) H₂O⁺+ OH^–
C) Cl^– +OH^–
D) Unionised HCl
Answer:
A) H₂O⁺+Cl^–

Question 13.
Sodium carbonate is a basic salt because it is a salt of
A) strong acid and strong base
B) weak acid and weak base
C) strong acid and weak base
D) weak acid and strong base
Answer:
D) weak acid and strong base

Question 14.
Calcium phosphate is present in tooth enamel. Its nature is
A) Basic
B) Acidic
C) Neutral
D) Amphoteric
Answer:
A) Basic

Question 15.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
A) Lemon juice
B) Vinegar
C) Common salt
D) An antacid
Answer:
D) An antacid

Question 16.
Which of the following gives the correct increasing order to acidic strength ? (  )
A) Water < Acetic acid < Hydrochloric acid
B) Water < Hydrochloric acid < Acetic acid
C) Acetic acid < Water < Hydrochloric acid
D) Hydrochloric acid < Water < Acetic acid
Answer:
A) Water < Acetic acid < Hydrochloric acid

Question17.
What happens when a solution of an acid is mixed with a solution of a base in varepsilon test tube?
i) The temperature of solution increases
ii) The temperature of solution decreases
iii) The temperature of the solution remains the same
iv) Salt formation takes place
A) (i) only
B) (i) and (ii)
C) (ii) and (iii)
D) (i) and (iv)
Answer:
D) (i) and (iv)

Question 18.
One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is :
A) Hydrochloric acid
B) Tartaric acid
C) Acetic acid
D) Sulphuric acid
Answer:
B) Tartaric acid

Question 19.
Which of the following substance will not give carbondioxide on treatment with dilute acid?
A) Marble
B) Lime stone
C) Baking soda
D) Lime
Answer:
D) Lime

Question 20.
Which of the following is not a acedic salt ?
A) CuSO₄
B) NH₄Cl
C) FeCl₃
D) CH₃COONa
Answer:

Question 21.
CaOCl₂ will liberate Cl₂ gas in presence of
i) CO₂
ii) HCl
iii) CO
iv) No
A) (i) and (ii)
B) (ii) and (iii)
C) (i) and (iv)
D) (ii) and (iv)
Answer:
A) (i) and (ii)

Question 22.
Egg shell is made up of
A) CaCO₃
B) CaO
C) Ca(OH)₂
D) CaCl₂
Answer:
A) CaCO₃

Question 23.
Curd cannot be stored in
i) Brass vessel
ii) Copper vessel
iii) Steel
iv) Bronze
A) (i), (ii), (iii)
B) (ii), (iii), (iv)
C) (i), (ii), (iv)
D) (i), (iii), (iv)
Answer:
C) (i), (ii), (iv)

Question 24.
An aqueous solution turns red litmis solution blue. Excess addition of which of the following solution would reverse in change ?
A) Baking powder
B) Lime
C) Ammonium hydroxide solution
D) Hydrochloric acid
Answer:
D) Hydrochloric acid

Question 25.
Which one of the following can be used as an acid-base indicator by a visually impared (blind) student ?
A) Litmus
B) Turmeric
C) Vanilla essence
D) Petunia leaves
Two statements are given below as Assertion (A) and Reason (R). Read the statements and choose the correct option.
Answer:
C) Vanilla essence

Question 26.
Assertion (A): When an acid reacts with a metal hydrogen gas is evolved and a corresponding salt is formed.
Reason (R): When a base reacts with a metal, along with the evolution of hydrogen gas a salt is formed which has a negative ion composed of the metal and oxygen.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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:
B) Both A and R are true but R is not the correct explanation of A.

Question 27.
Assertion (A): After white washing the walls, a shiny, white finish on walls is obtained after two or three days.
Reason (R): Calcium oxide reacts with carbon dioxide to form calcium hydrogen carbonate which gives a shiny white finish.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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) Both A and R are true and R is the correct explanation of A.

Question 28.
Assertion (A) : Mixing concentrated acids or bases with water is a highly exothermic process.
Reason (R) : Acids and bases neutralise each other to form corresponding salts and water.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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:
B) Both A and R are true but R is not the correct explanation of A.

Question 29.
Assertion (A): The strength of an acid or alkali can be tested by using a scale called the pH scale (0-14) which gives the measure of hydrogen ion concentration in a solution.
Reason (R) : A neutral solution has a pH of exactly 7, while an acidic solution has a pH less than 7 and basic solution a pH more than 7.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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:
B) Both A and R are true but R is not the correct explanation of A.

Question 30.
Assertion (A) : Baking powder is used in making cake instead of using only baking soda
Reason (R) : Baking powder contains tartaric acid which reacts with sodium carbonate removes bitter taste.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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) Both A and R are true and R is the correct explanation of A.

Question 31.
Assertion (A) : Plaster of Paris is stored in a moisture proof container.
Reason (R) : Plaster of Paris sets into a hard mass on wetting with water to form anhydrous calcium sulphate.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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:
C) A is true but R is false.

Question 32.
Assertion (A): The chemical formula of bleaching powder is CaOCl₂
Reason (R): Calcium oxide reacts with chlorine to form bleaching powder.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and 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:
C) A is true but R is false.

Question 33.
An aqueous solution ‘ A ‘ turns phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink colour disappears. The following statement is true for solution ‘ A ‘ and ‘ B ‘.
A) A is strongly basic and B is aweak base.
B) A is strongly acidic and B is aweak acid.
C) A has pH greater than 7 and B has pH less than 7
D) A has pH less than 7 and B has pH greater than 7
Answer:
C) A has pH greater than 7 and B has pH less than 7

Question 34.
Acid present in tomato is:
A) Methanoic acid
B) Acetic acid
C) Lactic acid
D) Oxalic acid
Answer:
D) Oxalic acid

Question 35.
Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink. Study the following table and choose the correct option.

	Nature	Ammonium chloride	Range Of pH
A)	acidic	weak acid and strong base	less than 7
B)	basic	weak acid and strong base	more than 7
C)	acidic	strong acid and weak base	less than 7
D)	basic	strong acid and strong base	7

Answer:
(C)

Question 36.
Two salts ’X’ and ‘Y’ are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution ‘X’ turns pink and the solution ‘Y’ does not show any change in colour, therefore X and Y are

	(X)	(Y)
A)	Na2CO3	NH4Cl
B)	Na2SO4	NaHCO3
C)	NH4Cl	Na2SO4
D)	NaNO3	Na2SO4

Answer:
(A)

Question 37.
Identify the basic salt from the following salts : (      )
A) Na₂CO₃
B) NH₄Cl
C) NaNO₃
D) KCl
Answer:
A) Na₂CO₃

Question 38.
Which of the options in the given table are correct ?

Option	Natural Source	Acid Present
i)	Orange	Oxalic acid
ii)	Sour milk	Lactic acid
iii)	Ant Sting	Methanoic acid
iv)	Tamarind	Acetic acid

A) (i) and (ii)
B) (i) and (iv)
C) (ii) and (iii)
D) (iii) and (iv)
Answer:
C) (ii) and (iii)

Question 39.
In the neutralization reaction when excess of acid is added to an alkali, salt and water are produced. What is the nature of the solution after the reaction occurs ?
A) Amphoteric
B) Acidic
C) Basic
D) Neutral
Answer:
B) Acidic

Question 40.
Anita added a drop each of diluted acetic acid and diluted hydrochloric acid on pH paper and compared the colours. Which of the following is the correct conclusion ?
A) pH of acetic acid is more than that of hydrochloric acid.
B) pH of acetic acid is less than that of hydrochloric acid.
C) Acetic acid dissociates completely in aqueous solution.
D) Acetic acid is a strong acid
Answer:
B) pH of acetic acid is less than that of hydrochloric acid.

Question 41.
The table below has information regarding pH and the nature (acidic/basic) of four different solutions. Which one of the options in the table is correct ?

Opium Solution		Colour of pH Paper	Approximate pH Value	Nature of the Solution
A)	Lemon juice	Orange	3	Basic
B)	Milk of magnesia	Blue	10	Basic
C)	Gastric juice	Red	6	Acidic
D)	Pure water	Yellow	7	Neutral

Answer:
(D)

Question 42.
In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the solution ‘X’ the solution ‘X’ first turns milky and then colourless. The option that justifies the above stated observation is that ‘X’ is aqueous calcium hydroxide and.

A) it turns milky due to carbon dioxide gas liberated in the reaction and after some time it becomes colourless due to formation of calcium carbonate.

B) it turns milky due to formation of calcium carbonate and on passing excess of carbon dioxide it becomes colourless due to formation of calcium hydrogen carbonate which is soluble in water.

C) it turns milky due to passing of carbon dioxide through it. It turns colourless as on further passing carbon dioxide, sodium hydrogen carbonate is formed which is soluble in water.

D) the carbon dioxide liberated during the reaction turns lime water milky due to formation of calcium hydrogen carbonate and after some time it turns colourless due to formation of calcium carbonate which is soluble in water.
Answer:
B) it turns milky due to formation of calcium carbonate and on passing excess of carbon dioxide it becomes colourless due to formation of calcium hydrogen carbonate which is soluble in water.

Question 43.
Read the following statements :
I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothemic.
II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic.
III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
Which of the above statements are correct: ( )
A) I and II
B) II and III
C) III and IV
D) I and IV
Answer:
A) I and II

Question 44.
Consider the pH value of the following acidic samples.

S.No	sample	pH Value
1.	Lemon Juice	2,2
2.	Gastric Juice	1.2
3.	Vinegar	3.76
4.	Dil. Acetic acid	3.0

The decreasing order of their H ion concentration is
A) 3>4>1>2
B) 2>1>3>4
C) 2>1>4>3
D) 3>4>2>1
Answer:
C) 2>1>4>3

Question 45.
Study the experimental set up shown in given figure and choose the correct option from the following

A) K2CO3	Cl2 gas	No change
B) KHCO3	CO2 gas	No change
C) KHCO3	H2 gas	Turns milky
D) K2CO3	CO2 gas	Turns milky

Answer:
(D)

Question 46.
Which of the following salts do not have the water of crystalisation ?
i) Bleaching Powder
ii) Plaster of Paris
iii) Washing soda
iv) Baking soda
A) (ii) and (iv)
B) (i) and (iii)
C) (ii) and (iii)
D) (i) and (iv)
Answer:
D) (i) and (iv)

Question 47.
Assertion (A): Burning of Natural gas is an endothermic process. ( )
Reason (R): Methane gas combines with oxygen to produce carbon dioxide and water.
A) Both (A) and (R) are true and (R) is the correct explanation of (A).
B) Both (A) and (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:
D) (A) is false, but (R) is true.

Question 48.
Select from then following salts which may be used to prepare hard water required for the experiment. ( )
1) CaSO₄
2) Na₂SO₄
3) CaCl₂
4) K₂SO₄
5) NaHCO₃
6) MgCl₂
A) 1,2 and 4
B) 1,3 and 6
C) 2,4 and 5
D) 3,5 and 6
Answer:
B) 1,3 and 6

Question 49.
The table given below shows the reaction of a few elements with acids and bases to evolve hydrogen gas ( )

	Acid	Base
a.	✗	✗
b.	✓	✓
c.	✓	✗
d.	✓	✓

Which of these elements form amphoteric oxides ?
A) a and d
B) b and d
C) a and c
D) b and c
Answer:
B) b and d

Question 50.
Even though rain water is the purest form of water, it acts as an electrolyte. How ever, distilled water cannot be an electrolyte. The reason for this is
A) rain water consists of dissolved oxygen
B) rain water consists of dissolved oxides of sulphur
C) rain water consists of dissolved Nitrogen
D) rain water consists of dissolved oxides of Hydrogen
Answer:
D) rain water consists of dissolved oxides of Hydrogen

Question 51.
The reason for different behaviour (floating) of Mg in dil. HCl is due to :
A) Mg is lighter element than dil HCl .
B) Mg reacts with dil. HCl to produce H₂ gas which helps in floating.
C) Mg reacts with dil. HC to produce N₂ gas which helps in floating.
D) Mg reacts with dil. HCl to produce CO₂ gas which helps in floating.
Answer:
B) Mg reacts with dil. HCl to produce H₂ gas which helps in floating.

Question 52.
A student collected the samples of acids such as : hydrochloric acid, acetic acid and bases such as sodium hydroxide and magnesium hydroxide from the science laboratory. He put 10 drops of each of the above sample solution on a watch glass and tested with a 1-2 drops of the following indicators as given below; and recorded his observations:

Sample Solution	Red litmus Solution	Blue litums Solution	Phenolphthalein Solution	Methyl orange Solution
a) HCl solution	No colour change	Changes to red	Colourless	Change to red
b) CH3COOH Solution	No colour change	Changes to red	Changes to red	Colourless
c) NaOH solution	Changes to blue	No colour change	Changes to light pink	remains as it is
d) Mg (OH)2 solution	No colour change	Changes to red	Changes to light pink	Colourless

The correct observation is made by a student:
A) a and b
B) a and c
C) b and c
D) b and d
Answer:
B) a and c

Question 53.
Which one observations is correct according to effect of acids and bases on some indicators

Test Sample	Red litmus	Blue litums	Phenolphthalein	Methyl orange
I. Dil. HCl	No effect	Turn red	No effect	Turn red
II. Dil. H2SO4	Turn blue	No effect	Turn pink	Turn red
III. Ca(OH)2	No effect	Turn red	Turn pink	Turn red
IV. Mg(OH)2	Turn blue	Turn red	No effect	No effect

A) I observation is correct
B) II observation is correct
C) III observation is correct
D) IV observation is correct
Answer:
B) II observation is correct

Question 54.
A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate respectively. If he now brings a burning splinter near the mouth of the test tubes immediately after adding the ethanoic acid in each one of them in which of the test tube or test tubes the flame gets extinguished ? ( )
A) X and Y
B) X and Z
C) Y and Z
D) Only Z
Answer:
D) Only Z

Question 55.
Observe the following experimental set-up
Statement – I : When (I) test tube and (II) test tube containing NaOH & HCl solution respectively are mixed together competely the colour of the solution changed to colourless.
Statement- II : When test tube (III) & (IV) are mixed together competely, the resultant solutions remains colourless.
A) Only (I) is correct
B) Only (II) is correct
C) Both (I) and (II) are correct
D) None of these
Answer:
C) Both (I) and (II) are correct

Question 56.
Four students studied reactions of Zinc and Na₂CO₃ with dil. HCl and dil NaOH solution and presented their result as follows. The ‘checkmark’ represents evolution of a gas where as ‘X’ represents no reaction.

The right set of observation is that of student.
A) a
B) b
C) c
D) d
Answer:
A) a

Question 57.
When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation?
A) No reaction takes place.
B) A coloureless gas with pungent smell is released with brisk effervescence.
C) A brown coloureless gas is released with brisk effervescence.
D) Formation of bubbles of a colourless and odourless gas.
Answer:
C) A brown coloureless gas is released with brisk effervescence.

Question 58.
In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Figure) was set up.

Which among the following statements (s) is tare) correct?
i) Bulb will not glow because electrolyte is not acidic.
ii) Bulb will )ow because NaOH is a strong base and furnishes ions for conduction.
iii) Bulb will not glow because circuit is incomplete.
iv) Bulb will not glow because It depends upon the type of electrolytic solution.
A) (i) and (iii)
B) (ii) and (iv)
C) (ii) only
D) (iv) only
Answer:
C) (ii) only

Question 59.
Given below is a reaction showing Chloralkali process

The products A, B and C are produced respectively
A) at the anode, at the cathode, near the cathode
B) near the cathode, at the anode, at the cathode
C) at the cathode, near the cathode, at the anode
D) at the anode, near the cathode, at the cathode.
Answer:
B) near the cathode, at the anode, at the cathode

Question 60.

In the activity shown in the diagram, if the climate is humid, the role of the calcium chloride taken in the guard tube is to ( )
A) absorb the evolved gas
B) warm up the gas
C) dry the gas
D) absorb chloride ions from the evolved gas.
Answer:
C) dry the gas

Question 61.
Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation ?
i) Soap is acidic in nature.
ii) Soap is basic in nature
iii) Turmeric is a natural indicator which gives reddish tinge in bases.
iv) Turmeric is a natural indicator which gives reddish tinge in acids.
Answer:
(i) and (ii)
B) (ii) and (iii)
C) (i) and (iv)
D) (ii) and (iv)
Answer:
B) (ii) and (iii)

Question 62.
With the reference to four gases CO₂, CO, Cl₂ and O₂, which one of the options in the table is correct ?

Option	Acidic Oxide	Used in the treatment of water	Product of respiration	Product of incomplete combustion
A)	CO	Cl2	O2	CO
B)	CO2	Cl2	CO2	CO
C)	CO2	O2	O2	CO2
D)	CO	O2	CO2	CO2

Answer:
(B)

Question 63.
Which of the given options correctly represents the parent acid and base of calcium carbonate ?

	Parent Acid	Parent Base
A)	HCl	NaOH
B)	H2SO3	Ca(OH)2
C)	H3PO3	CaSO4
D)	H2SO4	CaSO

Answer:
(B)

Question 64.
Put the following activities in the correct sequence to test the pH of soil. ( )
a) Put about 2 g of soil in a test tube
b) Shake the contents of the test tube
c) Collect the filtrate in a test tube
d) Check the pH of the filtrate with universal indicator paper
A) d, c, a, b
B) b, a, d, c
C) a, b, c, d
D) c, d, b, a
Answer:
C) a, b, c, d

Question 65.
Put the following activities in the correct sequence to test the change in odour of clove oil with dilute HCl and dilute NaOH solutions : ( )
a) Take some dilute HCl solution in one test tube and dilute NaOH solution in another.
b) Check the odour of clove oil.
c) Add a few drops of dilute vanilla essence to both test tubes and shake well.
d) Test the change in the odour of clove oil with dilute HCl and dilute NaOH solutions.
A) c, a, b, d
B) b, a, c, d
C) a, b, c, d
D) d, c, b, a
Answer:
B) b, a, c, d

10th Class Physical Science Bit Bank