141. A metal gives two cholrides A and B. A give black ppt with NH₃ and B gives white, With Kl, B gives a yellow ppt, which is soluble in excess of Kl, A and B are respectively

1. 1. Hg₂Cl₂, HgCl₂

   
   
   

   2. HgCl, Hg₂Cl₂

   
   
   

   3. ZnCl₂, HgCl₂

   
   
   

   4. HgCl₂, ZnCl₂

   
   
   

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   NA

   Correct Option: A

   NA

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142. Merscuric sulphide dissolves in aqua-regia to from

1. 1. Hg₂Cl₂

   
   
   

   2. HgCl₂

   
   
   

   3. Hg(NO₃)Cl

   
   
   

   4. Hg₂ (NO₃)₂

   
   
   

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   NA

   Correct Option: B

   NA

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143. 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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144. 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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145. 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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