Read the below given case and answer the following questions:
A science teacher lit a candle placed on a petri dish and carefully covered it with a glass tumbler. After some time, the candle flame became dim and finally went out. The teacher then removed the tumbler and added a small amount of lime water into the petri dish. The students observed that the lime water turned milky.
The teacher explained that the carbon present in the candle wax reacted with oxygen from the air during combustion and formed carbon dioxide gas. The milky appearance of lime water confirmed the presence of carbon dioxide. From this activity, the students understood that oxygen is necessary for combustion and that carbon dioxide is produced during the burning process.
The teacher explained that the carbon present in the candle wax reacted with oxygen from the air during combustion and formed carbon dioxide gas. The milky appearance of lime water confirmed the presence of carbon dioxide. From this activity, the students understood that oxygen is necessary for combustion and that carbon dioxide is produced during the burning process.
1. What is the main purpose of using lime water in this activity?
2. Which of the following substances was consumed during the burning of the candle?