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Class 10 Exam  >  Class 10 Tests  >  Assertion & Reason Test: Acids, Bases & Salts - 2 - Class 10 MCQ

Assertion & Reason Test: Acids, Bases & Salts - 2 - Class 10 MCQ


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15 Questions MCQ Test - Assertion & Reason Test: Acids, Bases & Salts - 2

Assertion & Reason Test: Acids, Bases & Salts - 2 for Class 10 2024 is part of Class 10 preparation. The Assertion & Reason Test: Acids, Bases & Salts - 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: Acids, Bases & Salts - 2 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Acids, Bases & Salts - 2 below.
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Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 1
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Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : In water, Hydrochloric acid behaves as a weak monobasic acid.

Reason : In water, Hydrochloric acid acts as a proton donor.

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 1
Assertion (A) is false but reason (R) is true. HCl (Hydrochloric) is a strong acid.

HCl ⇋ H+ + Cl-

It donate proton in water.

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 2
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Assertion : The acidity of Mg(OH)2 is two.

Reason : The acidity of a base is equal to the number of hydroxyl ions.

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 2

The number of replaceable hydroxyl (OH−) Ions in a base is called the acidity of that base. Magnesium hydroxide has 2 replaceable hydroxyl ions, therefore it's acidity is 2. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)

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Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 3
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Assertion : The aqueous solutions of glucose and alcohol do not show acidic character. Reason : Aqueous solutions of glucose and alcohol do not give H+ ions.

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 3

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 4
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Assertion : When zinc is added to dilute hydrochloric acid, hydrogen is given off.

Reason : Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 4

The correct answer is b) Assertion (A) is true but reason (R) is false.

Explanation:

  • Assertion (A): When zinc is added to dilute hydrochloric acid, hydrogen is indeed given off. This is a chemical reaction where zinc displaces hydrogen from hydrochloric acid, producing zinc chloride and hydrogen gas.

  • Reason (R): The statement that "Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms" is misleading. Hydrogen chloride (HCl) is a compound consisting of hydrogen and chlorine, but it doesn't accurately explain why hydrogen gas is evolved when zinc reacts with dilute HCl.

Therefore, the assertion is true, but the reason does not correctly explain it.

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 5
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Assertion : Gas bubbles are observed when sodium carbonate is added to dilute hydrochloride acid.

Reason : Carbon dioxide is given off in the reaction.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 5
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 6
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Assertion : During electrolysis of concentrated aqueous solution of sodium chloride, hydrogen is produced at anode and chlorine gas is produced at cathode.

Reason : Ions get attracted to oppositely charged electrodes.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 6
Assertion (A) is false but reason (R) is true.
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 7
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Assertion : pH = 7 signifies pure water.

Reason : At this pH, [H+] = [OH-]= 10-7.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 7

Let's evaluate the assertion and reason provided:

  • Assertion (A): pH = 7 signifies pure water.

    • This statement is true. Pure water at 25°C has a neutral pH of 7, which is a result of the equal concentrations of hydrogen ions [H+][H^+][H+] and hydroxide ions [OH−][OH^-][OH−].

  • Reason (R): At this pH, [H+] = [OH-] = 10^-7.

    • This statement is also true. In pure water at 25°C, the concentration of hydrogen ions [H+][H^+][H+] and hydroxide ions [OH−][OH^-][OH−] are both 10−710^{-7}10−7 M, leading to a pH of 7.

Conclusion:

Both the assertion and the reason are true, and the reason correctly explains the assertion.

Therefore, the correct answer is:

4. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 8
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Assertion : Weak acids have low electrical conductivity.

Reason : Strong acids and weak acids have equal concentration of hydrogen ions in their solutions.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 8
Assertion (A) is true but reason (R) is false.
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 9
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Assertion : H3PO4 and H2SO4 are known as polybasic acids.

Reason : They have two or more than two protons per molecule of the acid.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 9
Both A and R are true and R is the correct explanation of A.

Similarly bases which give two or more than two hydroxyl ions per molecule are known as polyacidic bases.

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 10
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Assertion : If the pH inside the mouth decreases below5.5, the decay of tooth enamel begins.

Reason : The bacteria present in the mouth degrades the sugar and left over food particles and produce acids that remain in the mouth after eating.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 10
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 11
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to three days.

Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 11
Calcium hydroxide is obtained by reaction of calcium oxide and water.
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 12
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Assertion (A): Ammonia solution is an alkali.

Reason (R): Ammonia solution turns blue litmus paper red.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 12
Ammonia solution, which is alkaline, turns the red litmus paper blue.
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 13
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): When common salt is kept open, it absorbs moisture from the air.

Reason (R): Common salt contains magnesium chloride.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 13

NaCl contains CaCl2 and MgCl2 impurities which are deliquescent i.e. absorbs moisture easily from atmosphere and hence Common salt get moisturised when kept open in air.

Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 14
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Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Pure water is neither acidic not basic.

Reason : The pH of a solution is inversely proportional to the concentration of hydrogen ions in it.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 14
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 15
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Assertion : Plaster of Paris is used by doctors by setting fractured bones.

Reason : When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 2 - Question 15
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Plaster of Paris when mixed with water and applied around the fractured limbs, it sets into a hard mass and keeps the bone joints in a fixed position. So, it is commonly used for setting fractured bones.
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