251. Spathic ore is

1. 1. Fe₂O_3. .3H₂O

   
   
   

   2. FeCO₃

   
   
   

   3. Fe₃O₄

   
   
   

   4. Fe₂O₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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252. Which alloy can have iron also

1. 1. Monel metal

   
   
   

   2. Constantan

   
   
   

   3. Aluminium bronze

   
   
   

   4. Brass

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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253. Match the List-I with List-II and select the correct answer using the codes given below the Lists
     

     	List-I		List-II
     F.	Blue vitriol	1.	Sodium bicarbonate
     G.	Epsom salt	2.	Sodium hydroxide
     H.	Baking soda	3.	Magnesium sulphate
     J.	Caustic soda	4.	Copper sulphate

     Codes :

     	F	G	H	J
     A.	3	4	2	1
     B.	4	3	2	1
     C.	3	4	1	2
     D.	4	3	1	2

1. 1. A.

   
   
   

   2. B.

   
   
   

   3. C.

   
   
   

   4. D.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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254. Which of the following metals do not form amalgam ?

1. 1. Zinc

   
   
   

   2. Copper Magnesium

   
   
   

   3. Iron

   
   
   

   4. .

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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255. Which of the following does not belong to 3d series of transition elements ?

1. 1. Palladium

   
   
   

   2. Iron

   
   
   

   3. Vanadium

   
   
   

   4. Titanium

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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