Redox Reactions · Chemistry · JEE Main

Thiosulphate reacts differently with iodine and bromine in the reactions given below: $$\begin{aligned} & 2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}...

The number of ions from the following that are expected to behave as oxidising agent is : $$\mathrm{Sn}^{4+}, \mathrm{Sn}^{2+}, \mathrm{Pb}^{2+}, \mat...

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When $$\mathrm{MnO}_2$$ and $$\mathrm{H}_2 \mathrm{SO}_4$$ is added to a salt $$(\mathrm{A})$$, the greenish yellow gas liberated as salt (A) is :...

Which of the following reactions are disproportionation reactions? (A) $\mathrm{Cu}^{+} \rightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}$ (B) $3 \mathrm{MnO}_...

In acidic medium, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ shows oxidising action as represented in the half reaction: $$ \mathrm{Cr}_2 \mathrm{O}_7{...

Chlorine undergoes disproportionation in alkaline medium as shown below : $$\mathrm{aCl}_{2(\mathrm{~g})}+\mathrm{b} \mathrm{OH}_{(\mathrm{aq})}^{-} \...

In alkaline medium, $$\mathrm{MnO}_4^{-}$$ oxidises $$\mathrm{I}^{-}$$ to

Which of the following cannot function as an oxidising agent?

Given below are two statements: Statement I : In redox titration, the indicators used are sensitive to change in $$\mathrm{pH}$$ of the solution. Stat...

$$2 \mathrm{IO}_{3}^{-}+x \mathrm{I}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}$$ What is the value of $$x$$ ?...

Which of the following options are correct for the reaction $$2\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rig...

A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with $$\mathrm{CH}_{3} ...

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$. Assertion A: Phenolpht...

Which of the given reactions is not an example of disproportionation reaction?

Which one of the following is an example of disproportionation reaction ?

The oxidation states of 'P' in H4P2O7, H4P2O5 and H4P2O6, respectively, are :...

Identify the process in which change in the oxidation state is five :

The oxidation states of nitrogen in NO, NO2, N2O and NO$$_3^ - $$ are in the order of :

Statement I : Sodium hydride can be used as an oxidising agent.Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.Choose...

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

The compound that cannot act both as oxidising and reducing agent is :

The redox reaction among the following is :

Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :

An example of a disproportionation reaction is :

The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is :

In order to oxidise a mixture of one mole of each of FeC2O4, Fe2(C2O4)3, FeSO4 and Fe2(SO4)3 in acidic medium, the number of moles of KMnO4 required i...

50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solut...

The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3 M CaSO4 is (Molar mass of CaSO4 = 136 g mol–1) ...

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is :

Which of the following reactions is an example of a redox reaction?

The volume of 0.1N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is :

In which of the following reactions H2O2 acts as a reducing agent? 1. H2O2 + 2H+ + 2e- $$\to$$ 2H2O 2. H2O2 - 2e- $$\to$$ O2 + 2H+ 3. H2O2 + 2e- $$\to...

Consider the following reaction: $$xMnO_4^- + yC_2O_4^{2-}$$ + zH+ $$\to$$ xMn2+ + 2yCO2 + $${z \over 2}{H_2}O$$ The value's of x, y and z in the reac...

Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?

Which of the following is a redox reaction ?

Only $$2 \mathrm{~mL}$$ of $$\mathrm{KMnO}_4$$ solution of unknown molarity is required to reach the end point of a titration of $$20 \mathrm{~mL}$$ o...

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $$(+)$$ _...

Number of moles of $$\mathrm{H}^{+}$$ ions required by $$1 \mathrm{~mole}$$ of $$\mathrm{MnO}_4^{-}$$ to oxidise oxalate ion to $$\mathrm{CO}_2$$ is ...

Total number of species from the following which can undergo disproportionation reaction is ________. $$\mathrm{H}_2 \mathrm{O}_2, \mathrm{ClO}_3^{-},...

$$2 \mathrm{MnO}_4^{-}+\mathrm{bI}^{-}+\mathrm{cH}_2 \mathrm{O} \rightarrow x \mathrm{I}_2+y \mathrm{MnO}_2+z \overline{\mathrm{O}} \mathrm{H}$$ If th...

The oxidation number of iron in the compound formed during brown ring test for NO$$_3^-$$ iron is ________.

See the following chemical reaction: $$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mat...

In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.

The sum of oxidation state of the metals in $$\mathrm{Fe}(\mathrm{CO})_{5}, \mathrm{VO}^{2+}$$ and $$\mathrm{WO}_{3}$$ is ___________.

In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________

Sum of oxidation states of bromine in bromic acid and perbromic acid is ___________.

The oxidation state of phosphorus in hypophosphoric acid is + _____________.

The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25...

The normality of $$\mathrm{H}_{2} \mathrm{SO}_{4}$$ in the solution obtained on mixing $$100 \mathrm{~mL}$$ of $$0.1 \,\mathrm{M} \,\mathrm{H}_{2} \ma...

$$20 \mathrm{~mL}$$ of $$0.02\, \mathrm{M}$$ hypo solution is used for the titration of $$10 \mathrm{~mL}$$ of copper sulphate solution, in the presen...

0.01 M KMnO4 solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume ...

The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is __________...

10.0 mL of 0.05 M KMnO4 solution was consumed in a titration with 10.0 mL of given oxalic acid dihydrate solution. The strength of given oxalic acid s...

Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.

0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with $${N \over {10}}$$ HCl using phenolphthalein as an indicator, 17.5 mL ...

The volume, in mL, of 0.02 M K2Cr2O7 solution required to react with 0.288 g of ferrous oxalate in acidic medium is _______. (Molar mass of Fe = 56 g ...

A 100 mL solution was made by adding 1.43 g of Na2CO3.xH2O. The normality of the solution is 0.1 N. The value of x is _____. (The atomic mass of Na is...

The oxidation states of transition metal atoms in K2Cr2O7, KMnO4 and K2FeO4, respectively, are x, y and z. The sum of x, y and z is _______....