Surface Chemistry

---

Question

---

Question 1 :

Read the Assertion and Reason carefully to mark the correct option out of the options given below:
Assertion : Increase in surface area, increase in rate of evaporation.
Reason : Stronger the intermolecular attractive forces, fast is the rate of evaporation at a given temperature.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.
5. If assertion is false but reason is true.
Answer
5690

Question 2 :

Which of the following terms is not related with colloids

1. Dialysis
2. Ultrafiltration
3. Wavelength
4. Brownian movement
Answer
5691

Question 3 :

According to adsorption theory of catalysis, the speed of the reaction increases because:

1. adsorption produces heat which increases the speed of the reaction.
2. in the process of adsorption, the activation energy of the molecules becomes large.
3. the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
4. adsorption lowers the activation energy of the reaction.
Answer
5692

Question 4 :

Wood charcoal is used to decolourise sugar because it

1. Adsorbs coloured material
2. Absorbs decolorised material
3. Reduces coloured material
4. None of these
Answer
5693

Question 5 :

Which one of the following is not a colloidal solution

1. Smoke
2. Ink
3. Air
4. Blood
Answer
5694