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

Question

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 170^oC, 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

Answer 1

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