Adsorption and Absorption

Q.

To an acidified dichromate solution, a pinch of Na₂O₂ is added and shaken. What is observed?

1. Bluish-given precipitate

2. Blue colour

3. Orange colour changing to green directly

4. Copious evolution of oxygen

Q. Which has maximum value of △ eq at constanttemperature assuming 100% ionisation of eachelectrolyte?(a) 0.1 M H2so4 d(c) 0.1 M H3PO3(b) 0.1 М H2po4(d) Equal

Q.

Which one of the following characteristics is associated with adsorption?

1. $\Delta G$ and $\Delta H$ are negative but $\Delta S$ is positive.

2. $\Delta G$ and $\Delta S$ are negative but $\Delta H$ is positive.

3. $\Delta G$ is negative but $\Delta H$ and $\Delta S$ are positive.

4. $\Delta G$, $\Delta H$ and $\Delta S$ all are negative.

Q. Paper chromatography is an example of:

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1. Adsorption chromatography
2. Column chromatography
3. Partition chromatography
4. Thin layer chromatography

Q. 2. Hydrolysis of NCl3 and PCl3 produces different products , why?

Q. 4 g of hydrogen reacts with 20 g of oxygen to form water.The mass of water formed i

Q. For the reaction, PCl3 (g) + Cl2 (g) = PCl5 (g) , ∆H = -x KJ If the ∆ Hf°PCl3 is -y KJ, what is ∆Hf°PCl5?

Q. 5. What is h-s-a-b concept about the nucleophilic reactions?

Q. 37. AlF3 is soluble in HF only in the presence of KF. It is due to the formation of 1) K3[AlF3H3] 2) K3[AlF6] 3) AlH3 4) K[AlF3H]

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Chemisorption leads to monolayer whereas physisorption leads to multilayer.

A : रसोवशोषण (रासायनिक अधिशोषण) के कारण एकलपरत बनती है जबकि भौतिक अधिशोषण के कारण बहुपरत बनती है।

R : Chemisorption is a reversible process whereas physisorption is an irreversible process.

R : रसोवशोषण (रासायनिक अधिशोषण) उत्क्रमणीय प्रक्रम होता है जबकि भौतिक अधिशोषण अनुत्क्रमणीय प्रक्रम होता है।

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
   
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है
   

Q. Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask ?

1. $H_2$
2. $N_2$
3. $S{O}_2$
4. $O_2$

Q. 7. How to convert Gram to mole ??

Q.

discuss the principle and method of softening of hard water by synthetic ion exchange resins

Q. Fruend and Lang were 2 scientists interested in adsorption.
Once in a discussion Fruend asked "Dude, I can see adsorption is spontaneous. But why is it always exothermic?"
Lang said "___".
Choose Lang's answer among the following options.

1. $\Delta G>0and\Delta S<0\Rightarrow \Delta H<0$, so it is exothermic
   
   
2. $\Delta G<0and\Delta S<0\Rightarrow \Delta H<0$, so it is exothermic
   
3. $\Delta G>0and\Delta S>0\Rightarrow \Delta H>0$, so it is exothermic
   
4. $\Delta G<0and\Delta S>0\Rightarrow \Delta H>0$, so it is exothermic
   

Q.

When I was eating chips, I noticed there very fine grains of spices on its surface. I tried to shake it off, but they weren't that easy to get rid of.
I wondered whether this is a case of adsorption. I'm such a nerd huh.
What do you think?

1. Of course!

2. No way!

3. It is a case of absorption

4. It is a case of desorption

Q. The adsorption of hydrogen by metals is called:

1. hydrogenation
2. absorption
3. occlusion
4. reduction

Q.

The variation of amount of gas absorbed per gram of adsorbent with pressure at different temperatures is given in the adjoining fig. Which of the following is correct relation?

1. T₁ > T₂ > T₃

2. T₂ > T₁ > T₃

3. T₃ > T₂ > T₁

4. T₁ = T₂ = T₃