JAC Chemistry Most Important Objective Type Questions for Class 12th 2021

 

 

Question:

 

1. In body centred unit cell, the particles are present as

 

A) at the corners and at the centre of the unit cell.
B) at the corners and at the centre of the units on each face.
C) at the corners only. 
D) at the corners and at the centre of the end.

Answer:(D) ??????? ??
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Question:

 

2. The packing fraction for the body centred cubic is

 

A) 0.42 
B) 0.68 
C) 0.52 
D) 0.74

Answer:(D) ???????
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Question:

3. Pure Silicon is

A) conductor  
B) insulator 
C) semiconductor 
D) none 

Answer:(D) ???????
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Question:

4. The coordination number in BCC is

A) 12
B) 6
C) 

• 8

D) 

4

Answer:(C) ?????? 
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Question:

5. Na crystallizes as BCC, the number of atoms in a unit cell 

A) 2
B) 3
C) 4
D) 14

Answer:(1) option
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Question:

6. Mg crystallizes as fcc, the total number of atoms per unit cell is

A) 3
B) 6
C) 4
D) 10

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Question:

 

7. Solubility of gas in liquid increases with-

 

A) increase of pressure and increase of temperature
B)  decrease of pressure and increase of temperature
C)  increase of pressure and decrease of temperature
D) 

decrease of pressure and temperature

Answer:(1) option
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Question:

 

8. The packing efficiency in fcc unit cell is

 

A)  74% 
B)  68%
C)  51%
D)  92%

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Question:

9. Liquid ccl4 which of the following has maximum solubility ?

A) Cl2
B) Br2
C) l2
D) NaCl 

Answer:(1) option
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Question:

10. which is not a colligative property?

A) freezing point
B) lowering of vapour pressure
C)  osmotic pressure
D) 

 elevation on boiling point

Answer:(1) option
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Question:

11. Isotonic solution have –

A) same boiling point
B)  same vapour pressure
C) same melting point
D) 

same osmatic pressure

Answer:(1) option
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Question:

12. As a result of osmosis the volume of solution is –

A) decreases 
B) increases
C) not affected
D) 

all of these

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Question:

 

13. The van’t Hoff factor more than Unity indicates the solute in solution is

 

A) options
B) options
C) options
D) options

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Question:

 

14. ??????

 

A) options
B) options
C) options
D) options

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Question:

 

15. ??????

 

A) options
B) options
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16. ??????

 

A) options
B) options
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17. ??????

 

A) options
B) options
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Answer:(1) option
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18. ??????

 

A) options
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Answer:(1) option
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19. ??????

 

A) options
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Answer:(1) option
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Question:

 

20. ??????

 

A) options
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21. ??????

 

A) options
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22. ??????

 

A) options
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23. ??????

 

A) options
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24. ??????

 

A) options
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25. ??????

 

A) options
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Answer:(1) option
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26. ??????

 

A) options
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27. ??????

 

A) options
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28. ??????

 

A) options
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29. ??????

 

A) options
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Question:

 

30. ??????

 

A) options
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Answer:(1) option
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