Redox Reactions · Chemistry · NEET
MCQ (Single Correct Answer)
The oxidation states not shown by Mn in given reaction is :
$$ 3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O} $$
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below :
Which reaction is NOT a redox reaction?
The correct option for a redox couple is:
On balancing the given redox reaction,
$$\mathrm{aCr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{bSO}_{3}^{2-}(\mathrm{aq})+\mathrm{cH}^{+}(\mathrm{aq}) \rightarrow 2 \mathrm{aCr}^{3+}(\mathrm{aq})+\mathrm{bSO}_{4}^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{2} \mathrm{H}_{2} \mathrm{O}(\ell)$$
the coefficients $$\mathrm{a}, \mathrm{b}$$ and $$\mathrm{c}$$ are found to be, respectively -
Which of the following reactions is a decomposition redox reaction?
CH4(g) + 4Cl2(g) $$ \to $$ CCl4(l) + 4HCl(g)
(a) 2Cu+ $$ \to $$ Cu2+ + Cu0
(b) 3MnO42+ + 4H+ $$ \to $$ 2MnO4- + MnO2 + 2H2O
(c) 2KMnO4 $$\buildrel \Delta \over \longrightarrow $$ K2MnO4 + MnO2 + O2
(d) 2MnO4- + 3Mn2+ + 2H2O $$ \to $$ 5MnO2 + 4$${H^ \oplus }$$
Select the correct option from the following :
MnO4– + C2O4 2– + H+ $$ \to $$ Mn2+ + CO2 + H2O
The correct coefficients of the reactants for the balanced equation are
($$-$$O$$-$$O$$-$$) bonds. Oxidation state of Cr in CrO5 is
(II) H2O2 + Ag2O $$ \to $$ 2Ag + H2O + O2
Role of Hydrogen peroxide in the above reactions is respectvely
H2O + Br2 $$ \to $$ HOBr + HBr
SO3$${_3^{2 - }}$$, S2O$${_4^{2 - }}$$ and S2O$${_6^{2 - }}$$ follow the order