Copper (0) oside ry hydrogen
n 을
Liquid L.
T T1
pa
Corabustion tube
Ice-cold water
(1) State the observation made in the combustion tube.
(1 mark)
(in) Write down the equation leading to formation of liquid L.
(1 mark)
(iii) What property of hydrogen is being investigated.
(1 mark)
(iv) Why is potassium oxide not used to investigate this property of hydrogen gas. I mark
(v) Hydrogen gas is used in hydrogenation of oils. What do you understand by the term hydrogenation?
(vi) Give any 2 other industrial uses of hydrogen gas.
(2 marks)
9. Fractional distillation of liquid air is mainly used to obtain nitrogen and oxygen.
(i) Name one substance that is used to remove carbon (IV) oxide from the air before it is
changed into liquid
(1 mark) (ii) Describe bow
nitrogen gas is obtained from the liquid air. (Boiling points nitrogen = -196°C, Oxygen = -183°C)​