291. Stannous fluoride is formede by

1. 1. Sn + HF

   
   
   

   2. SnO₂ + HF

   
   
   

   3. Sn + F

   
   
   

   4. SnO + HF

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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292. In the manufacture of safty matcheds, we use

1. 1. White phosphorus

   
   
   

   2. Black Phosphorus

   
   
   

   3. Violet phosphorus

   
   
   

   4. Red phosphorus

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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293. In the reaction N₂ + 3H₂ - 2NH₃ the catalyst used as

1. 1. Pt and Cu

   
   
   

   2. Fe and Mo

   
   
   

   3. NO an Pt

   
   
   

   4. Ni and Ti

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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294. Ozone turns starch iodine paper

1. 1. Green

   
   
   

   2. Blue

   
   
   

   3. Red

   
   
   

   4. Black

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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295. Name the flame having maximum temperature

1. 1. Oxy-hydrogen

   
   
   

   2. Bunsen-burner

   
   
   

   3. Oxy-acetylene

   
   
   

   4. Blow pipe burner

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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