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# Surface Chemistry (Grades 11-12)

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## Surface Chemistry

1.
As the temperature of the solid surface increases, the extent of adsorption of a gas
1. increases.
2. decreases.
3. remains unchanged.
4. first increases then decreases.

2.
1. exothermic
2. endothermic
3. irreversible
4. homogenous
3.
Enzymes are                       .
1. homogenous catalysts
2. heterogenous catalysts
3. acid catalysts
4. base catalysts

4.
What is the size of colloidal particles?
1. $10^-10 m to 10^-9 m$
2. $10^-6 m to 10^-4 m$
3. $10^-9 m to 10^-6 m$
4. $10^-5 m to 10^-2 m$
5.
The rate of reaction depends on the surface area of a catalyst in
1. homogeneous catalysis.
2. enzyme catalysis.
3. acid catalysis.
4. heterogeneous catalysis.

6.
The bond formed by a gaseous reactant with the surface of solid catalyst is
1. ionic
2. coordinate
3. covalent
4. metallic
7.
What is formed when a gaseous reactant is in contact with the surface of a solid catalyst?
1. homogeneous catalyst
2. ionic bond
3. heterogeneous catalyst
4. metallic bond

8.
Physisorption is defined as the adsorption that involves                                  forces between adsorbate and adsorbent particles.
9.
A colloidal system in which one liquid is dispersed in another liquid immiscible with it is called an emulsion.
1. True
2. False

10.
A substance that decreases the rate of a chemical reaction is called an                         .
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