Class 12th
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New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
According to the electrochemical series higher the positive value of standard reduction potential of metal ion, the higher is the oxidizing power
Therefore, MnO4− is the strongest oxidizing agent.
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
Incorrect order results from a balanced chemical equation. KClO3 + 6FeSO4 + 3H2SO4→KCl + 3H2O + 3Fe2 (SO4)3
This reaction is complex and occurs in several steps. The order is determined by the slowest in the reactions
New answer posted
a year ago
Contributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (ii)
According to the electrochemical series and standard reduction potential of metal, the higher the negative value of standard reduction potential stronger will be the reducing agent
In the given options, the standard reduction potential of chromium has the highest value so it is the strongest reducing agent.
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
Simple reactions occur in a single stage, whereas complicated reactions occur in multiple steps. Each phase in a multi-step process has its own molecularity, which is not added together. There is no molecularity in complex reactions. The sequence of a complex reaction is decided by the slowest step. As a result, it can be used for both simple and complex processes
New question posted
a year agoNew answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
The number of molecules of the reactants involved in an elementary reaction is referred to as the molecularity of the reaction. For this, a single molecule with a minimum molecularity of one is required, and it cannot be zero
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
(i) Conductivity of solution depends upon the size of ions as more is the size of ion, mobility decreases, and conductivity decreases so this option is incorrect.
(ii) Viscosity is the measure of the resistance of a liquid to flow. Greater will be the viscosity of solvent, less will be the flow of electrons and lesser will be the conductivity. Therefore, this option is incorrect.
(iii) Conductivity depends on the solvation of ions in the solution. Greater is the solvation, lesser will be the conductivity of the solution. Therefore, this option
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
On the application of external potential, an increased reaction starts till the opposing voltage becomes 1.1V.
However, further increase in the external potential leads the reaction to start in an opposite direction functioning as an electrolytic cell which is a device that uses electrical energy for carrying out electrochemical reactions.
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iv)
(i) Inert electrodes like graphite are a source of electrons in a reaction. It doesn't participate in a chemical reaction. Therefore, this option is incorrect
(ii) Inert electrode chemically doesn't participate in the reaction but it provides a surface either for oxidation and reduction reaction. Therefore, this option is incorrect
(iii) Inert electrodes provide surface for conduction of electrons so this option is incorrect.
(iv) Inert electrodes cease transfer of electrons for oxidation or reduction but not for redox reaction. Therefore
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
The difference between electrode potential potentials of two electrodes when no current is drawn through the cell is termed as cell emf. It is the energy provided by a cell per coulomb of charge passing through it. It is the maximum potential difference between the electrodes of a cell.
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