Retro JEE Main (Compilation of Last 13 Years Questions)
IIT JEE (Main & Advanced) past year questions with solutions & answer key
Retro IIT JEE (Main and Advanced) have questions from previous/past (10 to 13 years) papers
of IIT JEE (Main and Advanced) with solutions,
The following set of questions contain previous/past (10 to 13 years) questions of IIT JEE
(Main and Advanced) of Chapter "Redox Reaction" with solutions
Q. In which of the following reactions H2O2 acts as a reducing agent?
A species which is oxidised (de-electronation) is a reducing agent.
(I) Electronation — H2O2 is reduced
(II) De - electronation — H2O2 is oxidised (III) Electronation — H2O22 is reduced
(IV) De - electronation — H2O2 is oxidised
Thus, (II) and (IV) representreducing behaviour of H2O2.
Consider the following reaction,
The values of x, y and z in the reaction are, respectively
The half equations of the reaction are
The balanced half equations are
Equating number of electrons, we get
On adding both the equations, we get
Thus, x, y and z are 2, 5 and 16, respectively.
Which of the following chemical reactions depicts the oxidising behaviour of H2SO4?
The oxidation state of Cr in [Cr(NH3)4CI2]+ is
The oxidation state of chromium in the final product formed by the reaction between Kl and acidified potassium dichromate solution is
Oxidation number of Cl in CaOCI2 (bleaching powder) is
is a good oxidising agent in different medium changing to
Changes in oxidation number respectively, are
Which of the following is a redox reaction ?
In all these cases during reaction, there is no change in oxidation state of ion or molecule or constituent atom. These are simply ionic reactions.
Which of the following reaction is possible at anode ?
Oxidation takes place at anode. Hence, (a), (b) is not feasible as these are reduction reactions.'But Cr3+ is oxidised to under given condition.