Download App

Redox Reactions — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions3 Marks
Question
Using the standard electrode potentials given in the Table, predict if the reaction between the following is feasible:

Fe3+(aq) and I-(aq).
✓

Answer

The possible reaction between Fe3+(aq) + I-(aq) is given by,

$2\text{Fe}^{3+}_{(\text{aq})}+2\text{I}^-_{(\text{aq})}\rightarrow2\text{Fe}^{2+}_{(\text{aq})}+\text{I}_{2(\text{s})}$

$\text{Oxidation half equation:}\ \ \ \ \ \ \ \ \ \ 2\text{I}^-_{(\text{aq})}\xrightarrow{\ \ \ \ \ \ \ }\text{I}_{2(\text{s})}+2\text{e}^-;\ \ \text{E}^\circ=-0.54\text{V}\\\text{Reduction half equation:}\ [\text{Fe}^{3+}_{(\text{aq})}+\text{e}^-\xrightarrow{\ \ \ \ \ \ }\text{Fe}^{2+}_{(\text{aq})}]\times2;\ \ \text{E}^\circ=+0.77\text{V}\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2\text{Fe}^{3+}_{(\text{aq})}+2\text{I}^-_{(\text{aq})}\xrightarrow{\ \ \ \ \ \ \ \ }2\text{Fe}^{2+}_{(\text{aq})}+\text{I}_{2(\text{s})};\ \ \text{E}^\circ=+0.23\text{V}$

E° for the overall reaction is positive. Thus, the reaction between $\text{Fe}^{3+}_{(\text{aq})}$ and $\text{I}^-_{(\text{aq})}$ is feasible.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Redox Reactions→Redox Reactions — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Which of the following pairs of elements would have a more negative electron gain enthalpy? 
O or F
→
Arrange the species in each group in order of increasing ionisation energy and give reason:
  1. K+, Cl-, Ar
  2. Na, Mg, Al
  3. C, N, O
→
A bulb emits light of wavelength $4500\mathring{\text{A}}.$ The bulb is rated as 150 watt and 8% energy is emitted as light. How many photons are emitted by the bulb per second?
[h = 6.626 × 10-34Js]
→
What effect does branching of an alkane chain has on its boiling point?
→
In astronomical observations, signals observed from the distant starts are generally weak. If the photon detector receives a total of $=3.15 \times 10^{-18} J$ from the radiations of 600 nm . Calculate the number of photons received by the detector.
→
In a reaction
$A + B _2 \rightarrow AB _2$
Identify the limiting reagent, if any, in the following reaction mixtures.
(i) 300 atoms of A + 200 molecules of B
(ii) 2 mol A + 3 mol B
(iii) 100 atoms of A + 100 molecules of B
(iv) 5 mol A + 2.5 mol B
(v) 2.5 mol A + 5 mol B
→
The equilibrium constant for the following reaction is $1.6 \times 10^5$ at 1024 K
$H _2( g )+ B r _2( g ) \rightleftharpoons 2 H B r ( g )$
Find the equilibrium pressure of all gases if 10.0 bar of HBr is introduced into a sealed container at 1024 K .
→
Identify the type of redox reaction taking place in the following.
  1. $3\stackrel{0\ \ \ \ \ \ \ \ \ \ \ \ }{\text{Mg(s)}}+\stackrel{0\ \ \ \ \ \ \ \ \ \ \ }{\text{N}_2\text{(g)}}\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ }\ \stackrel{+2\ \ \ \ -3\ \ \ \ \ \ \ \ }{\text{Mg}_3\text{N}_2\text{(s)}}$
  2. $\stackrel{+5\ \ \ \ \ \ -2\ \ \ \ \ \ \ }{\text{V}_2\text{O}_5\text{(s)}}5\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{Ca(s)}}\xrightarrow{\ \ \ \ \ \ \ }2\stackrel{0\ \ \ \ \ \ \ \ }{\text{V(s)}}+\text{5}\stackrel{+2\ \ -2\ \ \ \ \ \ \ \ \ \ }{\text{CaO(s)}}$
  3. $2\stackrel{+1\ +5\ -2\ \ \ \ \ \ \ \ \ \ \ \ }{\text{KClO}_3(\text{s})}\xrightarrow{\ \ \ \ \ \ \ }2\stackrel{+1\ \ -1\ \ \ \ \ \ \ \ \ \ }{\text{KCl(s)}}+3\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{O}_2\text{(g)}}$
  4. $\stackrel{0}{\text{Ca}\text{(s)}}+2\stackrel{+1-2}{\text{H}_2\text{O}\text{l}}\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\stackrel{+2\ \ -2+1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }{\text{Ca(OH)}_2(\text{aq})}+\stackrel{0}{\text{H}}_2\text{(g)}$
  5. $\stackrel{0\ \ \ \ \ \ \ \ \ \ \ }{\text{Br}_2(\text{l})}+\stackrel{-1\ \ \ \ \ \ \ \ \ \ \ \ }{2\text{I}^-(\text{aq})}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\stackrel{1-}{\text{2Br}^-}(\text{aq})+\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{I}_2\text{(s)}}$
→
Calculate the molarity of a solution of ethanol in water, in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).
→
Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2 , SO2 and ClF3.
→