Question

How would you show that setting of curd is a chemical chang?

Answer 1

Oncethe curd is formed, milk cannot be re-obtained from it. Also, both milk and curd have different properties. Since these are the properties of a chemical change, setting of curd is a chemical change.

Answer 2

"When milk changes to curd due to the action of a bacterium called Lactobacillus, an entirely new substance is formed. The process has the following properties:

• Once curd is formed, it cannot be changed to milk by any physical or chemical means

• Milk and curd are chemically different compounds

• The reaction is irreversible.

Hence, setting of curd is a chemical change.

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