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When sugar crystals were reacted with concentrated sulphuric (VI) acid, a black solid A was formed which when dried, burnt in excess air to form a colourless gas B only while when concentrated sulphuric (VI) acid is reacted with liquid C at a temperature of 170oC, a colourless gas D is formed which turns yellow bromine water to colourless and also turns colour of substance E from purple to colourless.

  1. Identify substances :
    Gas B
    Liquid C
    Gas D
     
  2. Which property of concentrated sulphuric (VI) acid is being demonstrated by formation of the black solid

1 Answer

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  1.   
    • Gas B : Carbon (IV) oxide 
    • Liquid C : Ethanol 
    • Gas D : Ethene 
    • Substance E : Acidified potassium manganate (VII) 
  2. Dehydrating agent 
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