Multiple Answers Type Objective Questions :
Which of the following act as negative catalyst?

Ethanol in oxidation of chloroform

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Tetraethyl lead used as antiknocking agent

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Glycerol in the decomposition of

H_{2} O_{2}

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F e

in the formation of ammonia by Haber process

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Solution

The correct options are
A Ethanol in oxidation of chloroform
B Tetraethyl lead used as antiknocking agent
C Glycerol in the decomposition of $H_{2} O_{2}$
Chloroform forms a very poisonous compound called phosgene ( $C O C l_{2}$ ) when stored for a long time by reacting with oxygen in presence of sunlight.
$C H C l_{3} + 1 / 2 O_{2} \to C O C l_{2} + H C l$ In order to consume that phosgene gas and make chloroform safe, it is mixed with ethanol
Tetraethyl lead (TEL) is added to petrol to retard the ignition of petrol vapours on compression in an internal combustion engine and thus minimise the knocking effect.

$H_{2} O_{2}$ decomposes to water and oxygen in presence of light that's why it is stored in dark glass bottles. Glycerol is added to it act as negative catalyst
$N H_{3}$ is manufactured by Haber’s process. In this process, pure nitrogen and hydrogen gases react in the ratio of 1:3 in presence of iron as catalyst & molybdenum as promoter.
$N_{2} + 3 H_{2} F e / M o - --- \to 2 N H_{3} + h e a t$

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Similar questions

Give mechanism of the following reactions:

(a) In lead chamber process, $N O (g)$ is used as a catalyst in the oxidation of $S O_{2}$ to $S O_{3}$ .

(b) $N O (g)$ catalyses the decomposition of ozone to oxygen.

H_{2} O_{2}

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