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A student used the setup below to prepare a sample of nitrogen gas

(a) State the function of potassium hydroxide in the setup
(b) Give a suitable metal M for use in the combustion tube
(c) Give a reason why the nitrogen gas obtained is not pure

Answer Text:
(a) - To absorb carbon (IV) oxide from air.
(b) - Copper metal
(c) - It contain noble gases which are inert and cannot be removed at any stage.