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Answers
The burning of candle is physical as well as a chemical change. A physical change because the wax can be made into a candle again. But the wax wapours and the wick of the candle have been burnt so they can't be reversed and so in this way it is a chemical change
Milk gets sour in hot and humid weather because the temperature and weather provide suitable temperature for the growth of lactobacillus the bacteria responsible for the foemation of curd
When water is decomposed by electrolysis it gets decomposed into oxygen and hydrogen. And as we know that water is formed under high pressure and some particular conditions only and these conditions cannot be created in a laboratory so it is a chemical change.
Rusting of iron takes place in the presence of oxygen and mois t air and as we know that rust is nothing but hydroted ferric oxide because the iron makes itself stable so it cannot be changed back to its original form.