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Types of Catalysis

If Pt is used...

Question

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

A

Homogeneous catalysis

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B

Heterogenous catalysis

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C

Negative catalysis

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D

Auto catalysis

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Solution

The correct option is B
Heterogenous catalysis

Pt is solid and $H_{2} O_{2}$ is liquid

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Similar questions

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

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

H_{2} O_{2}

Phosphoric acid is used as a positive catalyst for 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}

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