Inorganic Chemistry -5

1.... Which of the following carbonyl does not obbey 18 electron rules ?

A. Cr(CO)6

B. Mn(CO)5

C. Fe(CO)5

D. Ni(CO)4

2.... Metal in carbonyl are ___

A. Low Oxidation state

B. High Oxidation state

C. Both

D. None of these

3.... Which of the following carbonyl does not follow EAN rules ?

A. V(CO)6

B. Cr(CO)6

C. Ni(CO)4

D. None of these

4.... Carbonyl cluster Rh6(CO)16 is :

A. Closo

B. Nido

C. Archno

D. None of these

5.... If some carbonyl group is replaced by ligands with no ability to back bond , the frequency of the carbonyl group :

A. Increase

B. Decrease

C. No effect

D. None of these

6.... Stretching frequency of carbonyl upon complex formation :

A. Decrease

B. Increase

C. No effect

D. None of these

7... As the electronegetivity of the substitute present in legend increase, the C-O stretching frequency :

A. Decrease

B. Increase

C. No effect

D. None of these

8... Very low N-O stretching frequency is found in nitrosyl complexes containing nitrosyl as :

A. NO-

B. NO+

C. Both

D. None of these

9.... Myoglobin contains Fe (||) in :

A. Low spin state

B. High spin state

C. Both 

D. None of these

10.... When beoxyhaemoglobin binds with oxygen , bond order and Vo2 of oxygen:

A. Decrease, Decrease

B. Increase, Decrease

C. Increase, Increase

D. None of these

11.... The unstable carbonyl species is :

A. Mn(CO)5

B. [Mn(CO)5]+

C. [Mn(CO)5]-

D. None of these

12.... The Oxidation state of iron in haemoglobin is:

A. 0

B. +1

C. +2

D. +3

13.... Number of unpaired electrones in oxyhemoglobin : 

A. 0

B. 2

C. 4

D. 6

14.... Number of unpaired electrones in a deoxyhemoglobin :

A. 0

B. 4

C. 6

D. None of these

15.... In Deoxyhemoglobin iron is: 

A. 3-coordinated 

B. 4- coordinated

C. 5- coordinated

D. None of these