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Chemistry Assertion (A) & Reason (B) MCQ

Electrochemistry · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 18 questions.

Questions

Assertion (A) & Reason (B) MCQ

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18 questions · timed · auto-graded

Question 11 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The conductivity of solution is greater than pure solvent.
Reason: Conductivity depends upon number of the ions present in solution.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation:
When electrolytes are dissolved in solvent they furnish their own ions in the solution hence, its conductivity increases.
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Question 21 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally.
Reason: Kohlrausch law helps to find the molar conductivity of a weak electrolyte at infinite dilution.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Explanation:
ln the plot of molar conductivity versus concentration, the extrapolation to zero concentration is not possible.
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Question 31 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The observed conductance depends upon the nature of the electrolyte and the concentration of the solution.
Reason: The cell constant of a cell depends upon the nature of the material of the electrodes.
Answer
  1. Assertion is correct statement but reason is wrong statement.
Explanation:
The cell constant depends upon the distance between the electrodes and their area of cross section.
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Question 41 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  2. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  3. If the Assertion is correct but Reason is incorrect.
  4. If both the Assertion and Reason are incorrect.
Assertion : On increasing dilution, the specific conductance keep on increasing.
Reason : On increasing dilution, degree of ionisation of weak electrolyte increases and molality of ions also
increases.
Answer
  1. If both the Assertion and Reason are incorrect.
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Question 51 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Conductance of a substance increases with decrease in resistance.
Reason: The inverse of resistance is called conductance.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation:
The conductance is the property of the conductor which facilitates the ftow of electricity th rough it how ever resistance resists the flow of electricity.
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Question 61 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Zinc displaces copper from copper sulphate solution.
Reason: Eº of zinc is -0.76V and that of copper is +0.34V.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
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MCQ 71 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Electrolysis of an aqueous solution of $KI$ gives $I_2$ at the anode but that of $KF$ gives $O_2$ at the anode not $F_2.$
Reason: $I^-$ ions have much higher oxidation potential than water while $F^-$ ions have much lower oxidation potential than water.
  • ✓
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Correct option: A.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
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Question 81 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Identification of cathode and anode is done by the use of a thermometer.
Reason: Higher the value of reduction potential, greater would be its oxidising power.
Answer
  1. Assertion is wrong statement but reason is correct statement.
Explanation:
Identification of cathode and anode is done by the use of ammeter/ voltmeter. Higher is the value of reduction potential greater would be its oxidising power.
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MCQ 91 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $\ce{KCl, NaCl}$ and $\ce{NH_4Cl}$ cannot be used in the salt bridge of a cell containing silver.
Reason: A salt bridge contains concentrated solution of an inert electrolyte like $\ce{KCl, KNO_3, K_2SO_4}$ or solidified solution of such an electrolyte in agar$-$agar and gelatine.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • ✓
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Correct option: B.
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
$\ce{KCl, NaCl}$ and $\ce{NH_4Cl}$ cannot be used as salt bridge in a cell containing silver as one of the electrodes because they react to form a precipitate of $\ce{AgCl}.$
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Question 101 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  2. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  3. If the Assertion is correct but Reason is incorrect.
  4. If both the Assertion and Reason are incorrect.
Assertion : The resistivity for a substance is its resistance when it is one meter long and its area of cross section is one square meter.
Reason : The SI units of resistivity is ohm metre ( m).
Answer
  1. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
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Question 111 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The electrical resistance of any object decreases with increase in its length.
Reason: The electrical resistance of any object decreases with increase in its area of cross-section.
Answer
  1. Assertion is wrong statement but reason is correct statement.
Explanation:
The electrical resistance of any object is directly proportional to its length, l, and inversely proportional to its area of cross-section, A. So, it increases with increase in length of object and decreases with increase in area of cross-section of object.
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MCQ 121 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Auric chloride $\ce{(AuCl_3)}$ solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason: Gold is a very precious metal.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • ✓
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Correct option: C.
Assertion is correct statement but reason is wrong statement.
Gold has higher reduction potential than the given metals.
Hence, $\ce{AuCl_3}$ will react with these metals.
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MCQ 131 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: At the end of electrolysis using platinum electrodes, an aqueous solution of copper sulphate tums colourless.
Reason: Copper in $\ce{CuSO_4}$ is converted to $\ce{Cu(OH)_2}$ during the electrolysis.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • ✓
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Correct option: C.
Assertion is correct statement but reason is wrong statement.
$Cu^{2+}$ ions are deposited as $Cu.$
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Question 141 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The potential difference between the two electrodes of a galvanic cell is called the cell potential.
Reason: Cell potential is equal to the emf of a cell.
Answer
  1. Assertion is correct statement but reason is wrong statement.
Explanation:
The cell potential is called the emf of the cell when the cell is used in such a manner that no current is drawn through the cell.
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Question 151 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: If $\lambda^\circ_{\text{Na}^+}$ and $\lambda^\circ_{\text{Cl}^-}$ are molarlimiting conductivities of the sodiumandchlorideionsrespectively, then the limiting molar conductivity for sodium chloride is given by the equation, $\wedge^\circ_{\text{NaCl}}=\lambda^\circ_{\text{Na}^{+}+}\lambda^\circ_{\text{Cl}^{-}}$
Reason: This is according to Kohlrausch law of independent migration of ions.
Answer
  1.  Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation:
According to Kohlrausch law, "limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte." 
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Question 161 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Substances like glass, ceramics, etc. having very low conductivity are known as insulators.
Reason: They do not allow the passage of electric current through them.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation:
The substances which do not allow the flow of electric current through them are termed as insulators.
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Question 171 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The conductivity depends on the charge and size of the ions in which they dissociate, the concentration of ions or ease with which the ions move under potential gradient.
Reason: The conductivity of solutions of different electrolytes in the same solvent and at a given temperature is same.
Answer
  1. Assertion is correct statement but reason is wrong statement.
Explanation:
The conductivity of solutions of different electrolytes in the same solvent and at a given temperature is different.
Effect of concentration on electrode potential is found by Nernst equation.
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MCQ 181 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: If standard reduction potential for the reaction,
$\ce{Ag^+ + e^- \rightarrow Ag}$ is $0.80$ volt, then for the reaction,
$\ce{2Ag^+ + 2e^- \rightarrow 2Ag},$ it will be $1.60$ volt.
Reason: If concentration of $Ag^+$ ions is doubled, the standard electrode potential remains same.
  • ✓
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Correct option: A.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
Standard reduction potential of an electrode has a fixed value.
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Assertion (A) & Reason (B) MCQ - Chemistry STD 12 Science Questions - Vidyadip