Redox Reactions - Physical Chemistry - Chemistry Previous Year Questions

Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?

In the ionic equation,

\(\mathrm{BiO_3^-+6H^++xe^-\rightarrow Bi^{3+}+3H_2O}\),

the value of x is

For decolourisation of 1 mole of KMnO\(_4\), the moles of H\(_2\)O\(_2\) required is

The oxidation number of Cr in CrO\(_5\) which has the following structure, is

Which of the following gas readily de-colourises the acidified KMnO\(_4\) solution?

KMnO\(_4\) acts as an oxidising agent in acidic medium. The number of moles of KMnO\(_4\) that will be required to react with one mole of oxalate ions (to form CO\(_2\)) in acidic solution is

In neutral medium \(\mathrm{KMnO}_4\) oxidises \(\mathrm{MnSO}_4\) to _________

Identify the catalyst used in the reaction between Iodide and persulphate ions.

$$2 \mathrm{I}^{-}+\mathrm{S}_2 \mathrm{O}_8{ }^{2-} \rightarrow \mathrm{I}_2+2 \mathrm{SO}_4{ }^{2-}$$

In the given Redox equation, identify the stoichiometric coefficients \(\mathrm{w}, \mathrm{x}, \mathrm{y}\) and \(\mathrm{z}\).

$$\mathrm{ClO}_3^{-1}+\mathrm{w} \mathrm{Cl}^{-1}+\mathrm{xH}^{+} \rightarrow \mathrm{y} \mathrm{H}_2 \mathrm{O}+\mathrm{zCl}_2$$

In the reaction,

$$2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-}$$

When \(3.92 \mathrm{~g}\) of Mohr salt is dissolved in \(100 \mathrm{~mL}\) of water, and titrated against \(\mathrm{KMnO}_4\) solution, \(20 \mathrm{~mL}\) of this solution required \(18 \mathrm{~mL}\) of \(\mathrm{KMnO}_4\) for complete oxidation. The strength of \(\mathrm{KMnO}_4\) is: [Molar mass of Mohr salt is \(392 \mathrm{~g} \mathrm{~mol}^{-1}\) and \(\mathrm{KMnO}_4\) is \(158 \mathrm{~g} \mathrm{~mol}^{-1}\)]

Identify the oxidation reaction in which acidified \(\mathrm{KMnO}_4\) is required

In the redox reaction between \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} / \mathrm{H}^{+}\) and sulphite ion, what is the number of moles of electrons involved in producing 3.0 moles of the oxidised product?

Choose the group of ions / molecules in which none of the species undergo Disproportionation reaction.

An inorganic salt comprises of atoms of elements \(\mathrm{A}, \mathrm{B}\) and \(\mathrm{C}\). If the oxidation numbers of A, B and \(\mathrm{C}\) are \(+3,+6\) and \(-\)2 respectively, what is the possible formula of the compound?

Given below are 2 statements: one Assertion and the other Reason. Which one of the following options is correct?

Assertion : Sulphur dioxide and Hydrogen peroxide can act as both oxidising and reducing agents but Nitric acid can act as only oxidising agent.

Reason : Sulphur and Oxygen can exhibit more than one stable oxidation states while Nitrogen does not.

Identify the correct coefficients (a), (b), (c) and (d) in the following equations

i) $\quad \mathrm{xMnO}_4^{--}+$(a) $\mathrm{SO}_3{ }^{2-}+$ (b) $\mathrm{H}^{+} \cdots \longrightarrow \mathrm{xMn}^{2+}+$ (a) $\mathrm{SO}_4{ }^{2-}+$ (c) $\mathrm{H}_2 \mathrm{O}$

ii) (c) $\mathrm{S}_2 \mathrm{O}_3{ }^{2-}+$ (d) $\mathrm{MnO}_4^{-}+\mathrm{H}_2 \mathrm{O} \cdots \rightarrow$ (d) $\mathrm{MnO}_2+$ (b) $\mathrm{SO}_4{ }^{2-}+\mathrm{xOH}^{-}$

In dilute alkaline solution \(\mathrm{MnO}_4^{-}\) changes to