281. The highest oxidation state shown by Mn is

1. 1. +2

   
   
   

   2. +3

   
   
   

   3. +6

   
   
   

   4. +7

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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282. Which of the following group elements easily form complexes ?

1. 1. s-block

   
   
   

   2. p-block

   
   
   

   3. d-block

   
   
   

   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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283. Nitrolim is a mixture of

1. 1. CaCN₂and N₂

   
   
   

   2. CaCN₂ and graphite

   
   
   

   3. CaC₂ and graphite

   
   
   

   4. Ca(CN)₂ and graphite

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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284. The colour given by calcium to the flame is

1. 1. green

   
   
   

   2. crimson red

   
   
   

   3. brick red

   
   
   

   4. violet

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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285. The element which is not a liquid at room temperatre (30^°C) is

1. 1. Hg

   
   
   

   2. Ga

   
   
   

   3. Br

   
   
   

   4. Ge

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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