116. Quartz is a crustalline variety of

1. 1. Silicon

   
   
   

   2. Silicon carbide

   
   
   

   3. Sodium silicate

   
   
   

   4. Silica

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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117. The basic structural unit in silicates is

1. 1. SiO^6-₆ ion

   
   
   

   2. SiO^2-₂ ion

   
   
   

   3. SiO^4-₄ ion

   
   
   

   4. SiO^2-₂ ion

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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118. Which of the most metallic ?

1. 1. P

   
   
   

   2. As

   
   
   

   3. Sb

   
   
   

   4. Bi

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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119. The oxidation state of phosphorus varies from

1. 1. -1 to +3

   
   
   

   2. -3 to +3

   
   
   

   3. -3 to +5

   
   
   

   4. -5 to +1

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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120. Which is not correctly matched ?

1. 1. Borazole : B₃N₃H₆

   
   
   

   2. Borax : Na₂B₄O₇.10H₂O

   
   
   

   3. Kernite : Na₂B₄O₆.3H₂O

   
   
   

   4. Othoboric acid :H₃BO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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