(C) The reaction between oxalic acid $(H_2C_2O_4)$ and acidified potassium permanganate $(KMnO_4)$ is slow at room temperature. As the reaction procee

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(C) The reaction between oxalic acid $(H_2C_2O_4)$ and acidified potassium permanganate $(KMnO_4)$ is slow at room temperature. As the reaction proceeds,$Mn^{2+}$ ions are produced. These $Mn^{2+}$ ions act as a catalyst for the reaction,increasing its rate. Since the product of the reaction itself acts as a catalyst,this phenomenon is known as autocatalysis,and the substance is called an autocatalyst.

Class 12 Chemistry Surface Chemistry Catalyst and Catalysis

Easy

In the titration between oxalic acid and acidified potassium permanganate,the manganous salt formed catalyses the reaction. The manganous salt is

A
$A$. $A$ promoter
B
$B$. $A$ positive catalyst
C
$C$. An autocatalyst
D
$D$. None of these

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Class 12

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Surface Chemistry

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Catalyst and Catalysis

In aqueous solution,$Na_2SO_3$ is oxidized by air,but $Na_3AsO_3$ is not. However,when air is passed through a solution containing both $Na_2SO_3$ and $Na_3AsO_3$,both are oxidized. This is an example of:

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Zeolites are useful as catalysts in ........

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Match the catalyst with the process:

Catalyst Process

$i. Na_{2}O$ $a. \text{Oxidation of } SO_{2} \text{ in the manufacture of } H_{2}SO_{4}$

$ii. TiCl_{4} + Al(CH_{3})_{3}$ $b. \text{Polymerisation of ethylene}$

$iii. PdCl_{2}$ $c. \text{The oxidation of ethyne to ethanal}$

$iv. \text{Nickel complexes}$ $d. \text{Polymerisation of alkynes}$

Which of the following is the correct option?

Catalyst	Process
$i. Na_{2}O$	$a. \text{Oxidation of } SO_{2} \text{ in the manufacture of } H_{2}SO_{4}$
$ii. TiCl_{4} + Al(CH_{3})_{3}$	$b. \text{Polymerisation of ethylene}$
$iii. PdCl_{2}$	$c. \text{The oxidation of ethyne to ethanal}$
$iv. \text{Nickel complexes}$	$d. \text{Polymerisation of alkynes}$