221. Which one is the most abundant on the earth crust ?

1. 1. Al

   
   
   

   2. B

   
   
   

   3. In

   
   
   

   4. Ga

   
   
   

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   NA

   Correct Option: A

   NA

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222. The chief one of aluminium is

1. 1. Kaolin

   
   
   

   2. Feldspar

   
   
   

   3. Cryolite

   
   
   

   4. Bauxite

   
   
   

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   NA

   Correct Option: D

   NA

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223. Which of the following metals are extracted by electrolytic reaction method ?

1. 1. Al

   
   
   

   2. Ag

   
   
   

   3. Cu

   
   
   

   4. Fe

   
   
   

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   NA

   Correct Option: A

   NA

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224. Amphoteric oxide is/are

1. 1. Al₂O₃

   
   
   

   2. P₂O₃

   
   
   

   3. Tl₂O₃

   
   
   

   4. CO₂

   
   
   

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   NA

   Correct Option: A

   NA

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225. Aluminium appears like gold when it is mixed with

1. 1. 90 % Cu

   
   
   

   2. 50 % Ni

   
   
   

   3. 90 % Sn

   
   
   

   4. 50 % Co

   
   
   

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   NA

   Correct Option: A

   NA

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