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MBD PUBLICATION-SOME P-BLOCK ELEMENTS-QUESTION BANK
- The most electropositive element is :
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- Alumina is the nature of :
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- All allums contain
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- The weakest Lewis acid is :
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- Metal protected by a layer of its own oxide is :
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- When orthoboric acid (H3BO3) is heated the residue left is :
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- Molecular weight of anhydrous aluminium chloride is :
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- on heating Al at 800^(@)C in air, Al2 O3 is formed. The reaction is :
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- Borax is :
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- Sapphire is a mineral of :
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- Borax on heating with cobalt oxide forms a blue bead of :
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- Alumina on heating with carbon in nitrogen atmosphere gives :
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- Hoope's process is used in the refining of :
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- The correct order of decreasing hardness of the following compound is ...
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- When Al is added to potassium hydroxide solution :
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- Purification of alumina is essential because :
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- Boron carbide,B4C is widely used for :
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- Which reaction cannot give anhydrous AlCl3 :
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- Which one is explosive ?
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- Which of the following is called alum ?
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