196. Cryolite is mineral used for extraction of

1. 1. Ca

   
   
   

   2. Cu

   
   
   

   3. Al

   
   
   

   4. Fe

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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197. Synthetic gas is a mixture of

1. 1. Steam and carbon monoxide

   
   
   

   2. Carbon monoxide and nitrogen

   
   
   

   3. Hydrogen and methane

   
   
   

   4. Hydrogen and carbon monoxide

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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198. Which of the fuel gases has composition by volume 34% CH₄ + 48% H₂ + 15% O₂ + 3% CO

1. 1. Oil gas

   
   
   

   2. Petrol gas

   
   
   

   3. Coal gas

   
   
   

   4. Water gas

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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199. Activated charcoal is employed to remove colouring matter from pure substance, it works by

1. 1. Bleaching

   
   
   

   2. Oxidation

   
   
   

   3. Reduction

   
   
   

   4. Adsorption

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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200. The compound in which oxygen shows +2 oxidation state

1. 1. H₂O₂

   
   
   

   2. CaO

   
   
   

   3. H₂O

   
   
   

   4. F₂O

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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