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In the case of chemisorption, why adsorp...

In the case of chemisorption, why adsorption first increases and then decreases with temperature?

A

Adsorbs coloured material

B

Adsorbs coloured material

C

Reduces coloured material

D

None of these

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**Step-by-Step Solution:** 1. **Understanding Chemisorption**: - Chemisorption is the process where a substance (adsorbate) forms a strong chemical bond with a surface (adsorbent). This process is characterized by the formation of chemical bonds between the adsorbate and the adsorbent. 2. **Role of Temperature**: - When the temperature is increased, heat energy is supplied to the system. This heat energy acts as activation energy, which is necessary for the adsorption process to occur. ...
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In case of chemical adsorption,

Assertion :- In case of chemical adsorption, (x)/(m) first increase then decrease with temp. Reason :- The intial increase is due to the fact that heat supplied acts as a activation energy. The decrease afterwards is due to the exothermic nature of adsorption at equilibrium.

Why does physisorption decrease with the increase of temperature ?

Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

A gas expands such that its initial and final temperatures are equal. Also the process followed by the gas traces a straight line on the P-V diagram (i) The temperature of the gas remains constant throughout (ii) The temperature of the gas first increases and then decreases (iii) The temperature of the gas first decreases and then increases (iv) The straight line has negative slope

Why does the speed of sound increase with increase in temperature?

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

The rate of chemisorption a. increaeses with decreases in temperature b. increases with increasesin tempreture c. increases with decreases in the pressure of gas d. is independent of the pressure of gas

Why does physisorption decrease with increase of temperature ?

Normally, solubility of a crystalline solid increases with temperature. Does it increase uniformly in all cases? Name a substance whose solubility : initially increases then decreases with rise in temperature.

VMC MODULES ENGLISH-SURFACE CHEMISTRY-LEVEL-1
  1. All colloids :

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  2. Which among the following statement is false?

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  3. In the case of chemisorption, why adsorption first increases and then ...

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  4. When the temperature is lowered and pressure is raised, the adsorption...

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  5. When the temperature is lowered and pressure is raised, the adsorption...

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  6. which one of the following is not applicable to chemisorption ?

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  7. Which of the following is a wrong statement for physisorption?

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  8. Which of the following statements is incorrect regarding physisorption...

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  9. Freundlich equation for adsorption of gases (in amount of Xg) on a sol...

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  10. Which of the following is not a surface phenomenon?

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  11. Which one of the following characteristics is not correct for physical...

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  12. Which is correct in case of van der Waals adsorption ?

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  13. During the adsorption of krypton on activated charcoal at low temperat...

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  14. Which of the following graphs represents freundlich adsorption isother...

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  15. Which of the following is not correct?

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  16. Identify the correct statement for the adsorption of a real gas on cha...

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  17. Freundlich adsorption isotherm is

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  18. The extent of adsorption of a gas on a solid depends on the :

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  19. Which of the following is not a characteristic of chemisorption?

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  20. Which is not correct regarding the adsorption of a gas on surface of s...

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