Redox Reactions · Chemistry · COMEDK

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MCQ (Single Correct Answer)

COMEDK 2024 Evening Shift
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...
COMEDK 2024 Morning Shift
An inorganic salt comprises of atoms of elements $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$. If the oxidation numbers of A, B and $$\mathrm{C}$$ ar...
COMEDK 2024 Morning Shift
Choose the group of ions / molecules in which none of the species undergo Disproportionation reaction.
COMEDK 2023 Morning Shift
In dilute alkaline solution $$\mathrm{MnO}_4^{-}$$ changes to
COMEDK 2023 Evening Shift
In neutral medium $$\mathrm{KMnO}_4$$ oxidises $$\mathrm{MnSO}_4$$ to _________
COMEDK 2023 Evening Shift
In the given Redox equation, identify the stoichiometric coefficients $$\mathrm{w}, \mathrm{x}, \mathrm{y}$$ and $$\mathrm{z}$$. $$\mathrm{ClO}_3^{-1}...
COMEDK 2023 Evening Shift
Identify the catalyst used in the reaction between Iodide and persulphate ions. $$2 \mathrm{I}^{-}+\mathrm{S}_2 \mathrm{O}_8{ }^{2-} \rightarrow \math...
COMEDK 2022
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...
COMEDK 2022
Which of the following gas readily de-colourises the acidified KMnO$$_4$$ solution?
COMEDK 2021
The oxidation number of Cr in CrO$$_5$$ which has the following structure, is ...
COMEDK 2021
For decolourisation of 1 mole of KMnO$$_4$$, the moles of H$$_2$$O$$_2$$ required is
COMEDK 2020
In the ionic equation, $$\mathrm{BiO_3^-+6H^++xe^-\rightarrow Bi^{3+}+3H_2O}$$, the value of x is
COMEDK 2020
Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?
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