Question 5(c)(i)
[Maximum number: 1]
Nitrates decompose when they are heated.
When hydrated copper(II) nitrate is heated, oxygen gas is produced.
Describe a test for oxygen.
test
observations
CAIE IGCSE Chemistry Gas Tests and Observations
Practise identifying common laboratory gases from splint tests, litmus or limewater changes and decolourisation of acidified manganate(VII).
How this is tested
- identify hydrogen by a squeaky pop with a lighted splint and oxygen by relighting a glowing splint
- identify ammonia with damp red litmus, carbon dioxide with limewater and chlorine by bleaching damp litmus
- identify sulfur dioxide by decolourising acidified potassium manganate(VII) from purple to colourless