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Nitric Acid

Negative cata...

Question

Negative catalyst for the decomposition of $H_{2} O_{2}$ is

A

Silica

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B

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C

Alumina

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D

Acetanilide

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Solution

The correct option is D Acetanilide
Decomposition of $H_{2} O_{2}$ is retarded in presence of acetanilide, it is a negative catalyst.

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Similar questions

Q. In presence of acetanilide, the rate of decomposition of

H_{2} O_{2}

reduced. Acetanilide is called a positive catalyst.

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

H_{2} O_{2}

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}

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

Phosphoric acid is used as a positive catalyst for the decomposition of

H_{2} O_{2}

.

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