Ncert Solutions Chemistry Class 12th

This is a Fill in the blanks Type Question as classified in NCERT Exemplar

Correct option: B

The Arrhenius equation can be used to calculate the activation energy of a chemical process. At two temperatures, this determines the rate constants.

2.303log = $\frac{{\mathrm{K}}_2}{{\mathrm{K}}_1}$ = $\frac{{\mathrm{E}}_{\mathrm{a}}}{\mathrm{R}}$       $\frac{{\mathrm{T}}_2-{\mathrm{T}}_1}{{\mathrm{T}}_1{\mathrm{T}}_2}$

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

Ans: Correct Option: (iv)

  (i) Copper sulfate can't be stored in zinc vessels due to less reactive nature than zinc due to the negative standard reduction value of zinc.

So both assertion and reason are false. Therefore, this option is incorrect.

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

Correct option: C

The assertion is valid, but the reasoning is erroneous because Arrhenius equation rate constants are accurate for both simple and complex molecules with suitable orientation during effective collision and sufficient kinetic energy to cause chemical change.

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

Ans: Correct Option: (i)

(i)At the equilibrium stage E $°$ _cell = 0 and current stops flowing in the cell. Therefore, the assertion is correct, the reason is correct and the reason is the correct explanation for assertion. Therefore, this option is correct

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

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.

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.

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

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