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Stoichiometry

Multiple Answ...

Question

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

A

Ethanol in oxidation of chloroform

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B

Tetra ethyl lead used as antiknocking agent

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C

Glycerol in the decomposition of

H_{2} O_{2}

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D

all are currect

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Solution

The correct option is D all are currect
A,B and C are correct.

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Q. Multiple Answers Type Objective Questions :

Which of the following act as negative catalyst?

Q. What is negative catalyst? Which is the negative catalyst in the decomposition of

H_{2} O_{2}

If Pt is used as catalyst in the decomposition of $H_{2} O_{2}$ , then it is an example of

If Pt is used as catalyst in the decomposition of $H_{2} O_{2}$ , then it is an example of

Thermodynamically, hydrogen peroxide is unstable as shown by the following equation:

H_{2} O_{2 (l)} \to H_{2} O_{(l)} + \frac{1}{2} O_{2 (g)}

Δ_{r} G^{o} = - 122.6 k J / m o l

As the reaction from left to right is accompanied by a decrease in free energy, it is a spontaneous process. However, its decomposition at

25^{o} C

in the absence of catalysts is slow. The catalysts which accelerate decomposition are Pt, Ag, cobalt, iron, copper, manganese dioxide and light. Concentrated

H_{2} O_{2}

solution can result into uncontrolled decompositions leading to explosion.

H_{2} O_{2}

thus stored in colored wax-lined bottles (as rough glass surfaces) also causes its decomposition. A few stabilizers such as acids acetanilide, pyrophosphates, and stannates are added to slow down the decomposition of

H_{2} O_{2}

H_{2} O_{2}

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