Class 12th

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Ans: Correct Option: (i)

The resistance of an ionic solution is measured by alternating current. The concentration of DC changes with electrolysis. Therefore, the assertion is correct, the reason is correct and the reason is a correct explanation of the assertion.

0 0

New answer posted

7 months ago

Assertion: All collision of reactant molecules leads to product formation.

Reason: Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Choose the correct answer out of the following choices.
A. Both assertion and reason are correct, and the reason is correct of assertion.
B. Both assertion and reason are correct, but reason does not explain assertion.
C. Assertion is correct, but reason is incorrect
D. Both assertion and reason are incorrect.
E. Assertion is incorrect, but reason is correct.

0 Follower 10 Views

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Three

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: E

The claim is erroneous, but the reason is right, because the correct assertion is that effective collision leads to the production of a product, and the reason states that the conditions of collision theory must be met for the reaction to be completed.

0 0

New answer posted

7 months ago

Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of ?2 .

Reason: Formation of oxygen at anode requires overvoltage

0 Follower 3 Views

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Ans: Correct Option: (i)

(i) Electrolysis of sodium chloride is represented by the following equations

H⁺ (aq)+ e⁻→12H₂ (g)

At the anode, the reaction goes this way,

Cl⁻ (aq)→12Cl₂ (g) + e⁻ E $°$ _cell =1.36V

2H₂O (aq)→O₂ (g) + 4H⁺ (aq)+ 4e− E $°$ _cell =1.23V

The reaction with the lower value E_cell is preferred but the formation of oxygen requires overpotential

Therefore, the assertion is correct, the reason is correct and the reason is the correct explanation for assertion. Therefore, this option is correct

0 0

New answer posted

7 months ago

Assertion: The enthalpy of reaction remains constant in the presence of a catalyst.

Reason: A catalyst participating in the reaction, forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

...more

0 Follower 1 View

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: A

Both the assertion and the reason are valid, and the reason is a correct of the assertion since the enthalpy of reaction is the difference between the total enthalpy of the reactants and products in the presence of a catalys

0 0

New answer posted

7 months ago

Class 12th Electrochemistry

Assertion: Mercury cell does not give steady potential.

Reason: In the cell reaction, ions are not involved in the solution.

0 Follower 2 Views

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Three

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Ans: Correct Option: (i)

(i)Mercury cells give a steady potential. The reason is that the ions are not involved in this reaction. The assertion is incorrect and the reason is correct so this option is incorrect

0 0

New answer posted

7 months ago

Assertion: Λm Weak electrolytes show a sharp increase when the electrolytic solution is diluted.

Reason: For weak electrolytes degree of dissociation increases with the dilution of solution

0 Follower 14 Views

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Ans: Correct Option: (i)

(i) Molar conductivity of weak electrolytes increases on dilution. In addition to solution the degree of dissociation increases leading to an increase in the number of ions produced. Therefore, Λm shows a sharp increase.

Therefore, the assertion is correct, the reason is correct and the reason is a correct explanation for assertion.

(ii) Assertion is correct, the reason is correct and the reason is the correct explanation of assertion. Therefore, this option is incorrect

(iii)Assertion and true both are correct therefore

...more

0 0

New answer posted

7 months ago

Assertion: Order and molecularity are same.

Reason: Order is determined experimentally, and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step.

0 Follower 7 Views

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: E

The order and molecularity may or may not be the same, assertion is false, but reason is right. The sum of the power of the reactants is the order of reaction, which may be easily determined. The total of the stoichiometric coefficient of the rate-determining elementary step determines molecularity

0 0

New answer posted

7 months ago

Class 12th Electrochemistry

Assertion: Conductivity of all electrolytes decreases on dilution

Reason: On dilution the number of ions per unit volume decreases.

0 Follower 1 View

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct Option: (i)

Ans: (i) Conductivity is due to the movement of ions. The number of ions present per unit volume decides the conductivity. It decreases on dilution. The number of ions per unit volume decreases on dilution. So, the assertion is correct, the reason is correct and the reason is the correct explanation of the assertion. Therefore, this option is correct

(ii) Assertion is correct, the reason is correct and the reason is the correct explanation of assertion. Therefore, this option is incorrect

(iii) Assertion and true both are correct therefore this

...more

0 0

New answer posted

7 months ago

Assertion: Order of the reaction can be zero or fractional.

Reason: We cannot determine order from balanced chemical equation.

0 Follower 7 Views

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Three

Contributor-Level 10

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: B

Both assertion and reason are valid, but reason does not explain assertion because the order of reaction can be zero or even fractional because the order of reaction is proportional to the total of the power of the reactants.

0 0

New answer posted

7 months ago

Assertion: E_cell should have a positive value for the cell to function

Reason: E_cathode < E_annode

0 Follower 1 View