Chemistry 1st Year Chapter 2 Experimental Techniques in Chemistry Notes MCQs Bank

chemistry 11th notes chapter 2

1. The solution left behind after the separation of crystals is called:

 
 
 
 

2. The solvent or mixture of solvent used for separation of compounds is called:

 
 
 
 

3. Size of filter paper is selected according to the amount of:

 
 
 
 

4. Crystallization does not involve:

 
 
 
 

5. A process controlled by distribution law:

 
 
 
 

6. The solid which is left over the filter paper is called:

 
 
 
 

7. In adsorption chromatography alumina and silica gel are used as:

 
 
 
 

8. The component which shows maximum affinity for stationary phase will have:

 
 
 
 

9. PB₂+ in paper chromatography are located by using:

 
 
 
 

10. Fluted filter paper is used to:

 
 
 
 

11. The separation of two miscible liquid by heating due to difference of their boiling points is called:

 
 
 
 

12. In CCI₄ solvent, I₂ show colour:

 
 
 
 

13. Cold finger is used for effective:

 
 
 
 

14. The technique used to separate insoluble particles from liquid is:

 
 
 
 

15. Safe and most reliable method of drying crystals is through:

 
 
 
 

16. Sintered crucible is made up of:

 
 
 
 

17. Mixture of NaCI and NH₄Cl can be separated by:

 
 
 
 

18. Which of the following can’t be filtered by sintered glass crucible:

 
 
 
 

19. Tip of funnel should be along the side of breaker to avoid:

 
 
 
 

20. Gooch crucibles are made up of:

 
 
 
 

Short Questions

1. Concentrated HCI and KMnO₄ solutions cannot be filtered by Gooch crucible.Give reason?
2. Define sublimation with an example?
3. Differentiate between stationary and mobile phase?
4. Give the main characteristics of the solvent used for crystallization.
5. Give the main uses of paper chromatography?
6. How crystals are dried using filter paper?Give its two disadvantages?
7. How desiccator is used to dry the crystals?
8. How do you justify that qualitative and quantitative analysis are discussed in analytical chemistry?
9. How does a Gooch crucible increase the rate of filtration?
10. How naphthalene can be purified?
11. How the decolonization of undesirable colors and dehydration is carried out for freshly prepared crystalline substances?
12. In solvent extraction technique repeated extractions using small portions of solvent are more efficient than using a single extraction but larger volume of solvent.Why?
13. Iodine is more soluble in water in presence of KI.Give reason?
14. Mention the major steps involved in the crystallization?
15. Mention various experimental techniques which are used for the purification?
16. What is ether extraction?
17. What is Rf value ? Give its units?
18. What is solvent extraction?
19. What is the distribution coefficient?To which technique it is applicable?
20. Which solvents are mostly used in crystallization?
21. Why is there a need t⁰Crystallize a crude product?

Long Questions

1. Write down the main characteristics of a solvent selected for crystallization of a compound.
2. You have been provided with a mixture containing three inks with diferent colours. Write down the procedure to separate the mixture with the help of paper chromatography.
3. Write a note on chromatography.

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