Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to demonstrate that oxides formed by nonmetals are acidic [title] Take a deflagrating spoon. [step] You can get such a spoon in a chemistry lab [title] Put some sulphur powder (a non-metal) in a jar. [step] They are yellow in colour.

Ending1: [title] Put a coloured ring (remember that the ring does not affect the colour of the jar) in the jar. [title] Put some sulphur crystals in the jar. Ending2: [title] Place some deflagrating sea salt (which can be natural or artificial) into the jar. [step] Leave until all the salt and sulphur together. Ending3: [title] Take 1 spoon of sulphur powder in a deflagrating spoon. [title] Heat the deflagrating spoon using a minus heater. Ending4: [title] Put in sulphur's fertilizer (it's dark brown) in a container. [step] It doesn't have to be that green.

Answer format: ending1/ending2/ending3/ending4