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Standard XII
Physics
Question

Statement I: In adsorption process, the value of ΔH is always negative.
Statement II: During adsorption surface area of adsorbent decreases.
Which of the above statement is/are true? Choose the correct option.
  1. Only I
  2. Only II
  3. I and II
  4. None of these

A
Only I
B
I and II
C
None of these
D
Only II
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Q1
Statement I: In adsorption process, the value of ΔH is always negative.
Statement II: During adsorption surface area of adsorbent decreases.
Which of the above statement is/are true? Choose the correct option.
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Q2
Consider the following statements regarding adsorption
I. During adsorption, there is decrease in residual forces of the surface which leads toa decrease in surface energy which appears as heat.
II. The residual forces on the atoms at the surface are attractive in nature.
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IV. The bond formed between the adsorbate and the adsorbement during chemisorption is always covalent.

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Q3
Amongst the following statements regarding adsorption, those that are valid are
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(d) With increase in temperature, the equilibrium concentration of adsorbate increases

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(a) ΔH becomes less negative as adsorption proceeds
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Q5
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C. Adsorption is an endothermic process.
D. The extent of adsorption decreases with increase in temperature for a physiosorption process.
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