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Balancing of Redox Reaction: Oxidation Number Method - (Concept)
While balancing a given reaction by this method, following steps are to be followed :
- Assign oxidation state to each element (atom) on both sides of the equation and identify which element has been oxidised and which reduced.
- Calculate the increase or decrease in the oxidation number per atom.
- Multiply by suitable integers so as to equalise the total increase or decrease in oxidation state of the species involved.
- Balance atoms undergoing oxidation and reduction apart o and H.
- Balancing of the total charge in the equation using H+ or OH- depending upon the medium.
-
In Acidic medium, count total charge on both sides and balance it by adding H+ ions to the required side (i.e., to the side deficient in positive charge). Finally, add enough water molecules to balance H and O atoms to the required side.
-
In a Basic medium, balance the charge by adding OH- ions to the side with excess of positive charge and finally add required number of H2O molecules to the appropriate side to balance O and H.
| Exam | Chapter |
| JEE MAIN | Redox Reaction and Electrochemistry |
Balance the following reaction using oxidation number method
and find the values of a,b,c,x,y,z.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Consider the following reaction:
The values of
,
and
in the reaction are, respectively:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The reaction of sulphur in alkaline medium is given below:
The value of 'a' is __________ (Integer answer)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In basic medium oxidizes
to form
and itself changes into
. The volume of 0.154 M
required to react with 40mL of 0.25 M
is _____ mL .(Rounded off to the nearest integer)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
If the above equation is balanced with integer coefficients,the value of c is ____(Round off to the Nearest Integer).
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In a neutral or faintly alkaline medium, being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulfate. In this reaction, the overall change in the oxidation state of manganese will be :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
When of an aqueous solution of
ions was titrated in the presence of dil.
using diphenylamine indicator,
solution of
was required to get the end point. The molarity of the solution containing
.
The value of is _____(Nearest integer)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
When of an aqueous solution of
was titrated in an acidic medium, an equal volume of
of an aqueous solution of ferrous sulphate was required for complete discharge of color. The strength of
in grams per litre is________
(Nearest integer)
[Atomic mass of ]
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is
(Response should be only in integer like 67 or 8).
| A. |
|
| B. |
|
| C. |
|
| D. |
|
A 2.0 g sample containing is treated with
liberating
. The
gas is passed into a solution of
is required to titrate the liberated iodine, The percentage of
in the sample is _________. (Nearest integer)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The oxidation state of chromium in the final product formed by the reaction between and acidified potassium dichromate solution is
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Balance the following reaction:
and find the value of x+y+z, When the above reaction is balanced with smallest coefficient.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Balance the following reaction:
and find the value of a+b+c.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
2.68 x 10-3 moles of a solution containing an ion An+ required 1.61 x 10-3 moles of MnO-4 for the oxidation of An+ to in an acidic medium. What is the value of n?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Iodine reacts with concentrated to yield Y along with other products. The oxidation state of iodine in Y, is :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
A mixture of potassium chlorate, oxalic acid, and sulphuric acid is heated. During the reaction which element undergoes the maximum change in the oxidation number?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
If 5 moles of BaCl2 is mixed with 2 moles of Na3PO4, the maximum number of moles of Ba3(PO4)2 formed is______ (Nearest integer)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
What is the value of x?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute
. Number of water molecules produced for 2 molecules of
is_________.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
See the following chemical reaction :
The sum of X, Y and Z is _____.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The total change in the oxidation state of manganese involved in the reaction of and potassium iodide in the acidic medium is __________ .
| A. |
|
| B. |
|
| C. |
|
| D. |
|
How many moles of potassium magnate is required to react with 2 moles of Sodium Sulphite?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
For the reaction of and HCl what is the net oxidation change in Mn?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The number of moles of sulphur produced when 2 moles of reacts with
in sulphuric acid is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
When 2.5 mol of is reduced to 2.5 mol of NO, how many moles of water are generated?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
If 6 moles of reacts with 30 moles of Mohr’s salt in acidic medium, how many moles of water molecule are generated?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
What is the correct balanced reaction for the following reaction?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Choose the balanced reaction for the formation of from
?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Choose the balanced reaction for decomposition of azide with nitrite in presence of acid:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Iodate ions convert into orthoperiodate ions under alkaline conditions. Choose the correct balanced reaction:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
$\mathrm{I}^{-}+\mathrm{IO}_3^{-}+H^{+} \longrightarrow \mathrm{I}_2+\mathrm{H}_2 \mathrm{O}$ In the balanced equation sum of coefficients of products is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In alkaline medium, $\mathrm{MnO}_4^{-}$oxidises $\mathrm{I}^{-}$to :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Chlorine undergoes disproportionation in alkaline medium as shown below :
$\mathrm{aCl}_{2(\mathrm{~g})}+\mathrm{b} \mathrm{OH}_{(\mathrm{aq})}^{-} \rightarrow \mathrm{c} \mathrm{ClO}_{(\mathrm{aq})}^{-}+\mathrm{d} \mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{e} \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$
The value of a, b, c and d in a balanced redox reaction are respectively :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
$2 \mathrm{MnO}_4^{-}+\mathrm{bI}^{-}+\mathrm{cH}_2 \mathrm{O} \rightarrow \mathrm{xI}_2+\mathrm{yMnO}_2+\mathrm{z} \overline{\mathrm{O}} \mathrm{H}$
If the above equation is balanced with integer coefficients, the value of z is_________.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In writing equations for oxidation-reduction reactions, just as for other reactions, the compositions and formulas must be known for the substances that react and for the products that are formed.
