Citric acid + Sodium bicarbonate → Carbon dioxide + Sodium citrate
Maharashtra Board Class 8 Chemical Change and Chemical Bond Extra QA
Q: Is sodium chloride an ionic or covalent compound?
A: Sodium chloride is an ionic compound.
Q: What happens during the process of rusting of iron?
A: Rusting of iron is a slow chemical change where iron reacts with oxygen and moisture to form iron oxide, commonly known as rust.
Q: What is respiration, and is it a chemical change?
A: Respiration is a biological process where glucose reacts with oxygen to produce carbon dioxide and water. Yes, it is a chemical change.
Q: How does hard water soften when mixed with washing soda?
A: Hard water softens by reacting with washing soda, forming calcium carbonate and sodium chloride.
Q: Why do bubbles appear when lemon juice is added to baking soda?
A: Bubbles form when citric acid in lemon juice reacts with sodium bicarbonate in baking soda, producing carbon dioxide gas.
