Go through the following question and provide the answer:
Pratyush investigates the chemical nature of substances formed when metals and non-metals burn in air. The products are tested using water and litmus paper to understand their acidic or basic character and reactivity with oxygen.
Chemical properties of metals and non-metals
1. Sulphur burns in air to form a gas that turns blue litmus red.
Which property of the product causes this change?
2. The blue-to-red litmus change observed when sulphur dioxide dissolves in water is due to the formation of