When KMnO_4 solution is added to hot oxalic acid solution, the de… - Vidyadip

MCQ

When $KMnO_4$ solution is added to hot oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after sometime. This is because

✓
$Mn^{+2}$ acts as autocatalyst
B
$CO_2$ is formed
C
Reaction is exothermic
D
$MnO_4^-$ catalyses the reaction

✓

Answer

Correct option: A.

$Mn^{+2}$ acts as autocatalyst

a
Here, KMnO4 is a reactant in the reaction which forms Mn2+ which acts as an
auto-catalyst. The reaction is slow initially because MnO4- is getting converted to Mn2+ but once Mn2+ forms, the reaction becomes faster due to the
catalytic action

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

$HN{O_2}$ acts as

Which is the most stable conformer along the $2, 3\, C - C$ bond axis of the compound ?

The orbital angular momentum of an electron in $2s$-orbital is

Dipole moment is shown by

The attacking (electrophilic) species in sulphonation of benzene is

What are the major products from the following reaction ?

In a reaction, if half of the double bond is broken and two new bonds are formed, this is a case of

$AB, A_2$ and $B_2$ are diatomic molecules. If the bond enthalpies of $A_2, AB$ and $B_2$ are in the ratio $1:1 : 0.5$ and enthalpy of formation of $AB$ from $A_2$ and $B_2$ is $-100\, kJ\, mol^{-1}$ . What is the bond energy of $A_2$ .............. $\mathrm{kJ\,mol}^{-1}$

Product of the reaction is

$C{H_3}MgI$ will give methane with