246. Iron loses magnetic property at

1. 1. Melting point

   
   
   

   2. Curie point

   
   
   

   3. 1000^°K

   
   
   

   4. Boiling point

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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247. How many electrons are involved in the oxidation by KMnO₄ in basic medium ?

1. 1. 5

   
   
   

   2. 3

   
   
   

   3. 2

   
   
   

   4. 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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248. Ferrosilicon is used the steel industry as

1. 1. Cutting tool

   
   
   

   2. Flux

   
   
   

   3. A reducing agent

   
   
   

   4. Alloyint agent

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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249. Asbestos is silicate mineral of calcium and

1. 1. K

   
   
   

   2. Al

   
   
   

   3. Ba

   
   
   

   4. Mg

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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250. Zone refining is a method to obtain

1. 1. High temperature

   
   
   

   2. Ultra pure oxides

   
   
   

   3. Ultra pure metals

   
   
   

   4. all of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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