271. Oxidation state of iron in Haemoglobin is

1. 1. +2

   
   
   

   2. +3

   
   
   

   3. 0

   
   
   

   4. -2

   
   
   

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   NA

   Correct Option: A

   NA

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272. Steel contains

1. 1. Fe + Mn

   
   
   

   2. Fe + Cr + Mn

   
   
   

   3. Fe + Mn + C

   
   
   

   4. Fe + C + Al

   
   
   

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   NA

   Correct Option: C

   NA

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273. The number of unpaired electrons in Fe⁺², Fe⁺³, Ni⁺² are respectively

1. 1. 4,5,5

   
   
   

   2. 4,5,2

   
   
   

   3. 5,2,4

   
   
   

   4. 5,4,2

   
   
   

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   NA

   Correct Option: B

   NA

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274. Californium is the member of

1. 1. Actinides

   
   
   

   2. Lanthanides

   
   
   

   3. Alkali metals

   
   
   

   4. Alkalines earth metals

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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275. The compounds of alkaline earth metals possess which of the following magnetic nature ?

1. 1. Paramagnetic

   
   
   

   2. Diamagnetic

   
   
   

   3. Ferromagnetic

   
   
   

   4. Antiferromagnetic

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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