Question

An example of a change which occurs on mixing two substances, but can be reversed.

Mixing of washing soda and lemon juice
Mixing a quick lime with water
Mixing curd to warm milk
Dissolving salt in water

Answer 1

Answer:

mixing curd to warm milk

Explanation:

Because if we heat curd we get warm milk and if we store the milk we get curd

Answer 2

Answer:

Here, the reversible process is ,salt in water(d) , as after mixing it can be reversed through evaporation as done in coastal areas.

Explanation:

Hope it helps