Redox Reactions CBSE Questions & Answers

Standard electrode potential for \({\text{Sn}}_4^ + /{\text{Sn}}_2^ + \) couple is +0.15 V and that for the \({\text{C}}{{\text{r}}^{{\text{3}} + }}\) / Cr couple is –0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

Standard electrode potential of three metals X, Y and Z are –1.2 V, +0.5 V and –3.0 V respectively. The reducing power of these metals will be

The oxidation state of iron in \({{\text{K}}_{\text{4}}}\left[ {{\text{Fe }}{{\left( {{\text{CN }}} \right)}_{\text{6}}}} \right]\) is

The standard emf of a galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is ______.

E1, E2 and E3 are the emfs of the following three galvanic cells respectively: A. \({\text{Zn }}\left( {\text{s}} \right){\text{ }}\left| {{\text{ Z}}{{\text{n}}^{{\text{2}} + }}\left( {0.{\text{1 M}}} \right){\text{ }}} \right|\left| {{\text{ C}}{{\text{u}}^{{\text{2}} + }}\left( {{\text{1M}}} \right){\text{ }}} \right|{\text{ Cu }}\left( {\text{s}} \right)\) B. \({\text{Zn }}\left( {\text{s}} \right){\text{ }}\left| {{\text{ Z}}{{\text{n}}^{{\text{2}} + }}\left( {{\text{1 M}}} \right){\text{ }}} \right|\left| {{\text{ C}}{{\text{u}}^{{\text{2}} + }}\left( {{\text{1M}}} \right){\text{ }}} \right|{\text{ Cu }}\left( {\text{s}} \right)\) C. \({\text{Zn }}\left( {\text{s}} \right){\text{ }}\left| {{\text{ Z}}{{\text{n}}^{{\text{2}} + }}\left( {{\text{1 M}}} \right){\text{ }}} \right|\left| {{\text{ C}}{{\text{u}}^{{\text{2}} + }}\left( {0.{\text{1M}}} \right){\text{ }}} \right|{\text{ Cu }}\left( {\text{s}} \right)\) Which one of the following is true?

\(6{I^ - }(aq) + 2MnO_4^ - (aq) + 4H2O(l)?3I2(s) + 2MnO2(s) + 8O{{\text{H}}^ - }\left( {{\text{aq}}} \right)\) The above balanced ionic equation represents redox reaction where one of the following takes place.

A metal in a compound can be displaced by another metal in the uncombined state. Which metal is a better reducing agent in such a case?

Hydrogen is prepared from \({{\text{H}}_{\text{2}}}{\text{O}}\) by adding

In the conversion of \({\text{B}}{{\text{r}}_{\text{2}}}\) to Bro3- , the oxidation number of Br changes from

In the reaction \({\text{2}}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O }} + {\text{ }}{{\text{O}}_{\text{2}}}\)

Consider the elements: Cs, Ne, I and F. Identify the element(s) that exhibits only negative oxidation state

Consider the elements :Cs, Ne, I and F. Identify the element(s) that exhibits only negative oxidation state

Consider the elements :Cs, Ne, I and F. Identify the element that exhibits both positive and negative oxidation states.

Consider the elements: Cs, Ne, I and F. Identify the element which exhibits neither the negative nor does the positive oxidation state.

In Ostwald’s process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.00 g. of ammonia and 20.00 g of oxygen ?