Question

give one example in each case ■ i) Change which occurs on heating but cannot be reversed.
■ ii) Change which occurs on cooling but can be reversed.
■ iii) Change which occurs on mixing two substances, but can be reversed.
■ iv) Change which occurs on mixing two substances, but cannot be reversed.​

Answer 1

. heating of an iron rod

. formation of ice from water

. formation of salt solution

. mixing of cement and water

Answer 2

Answer:

i. heating of an iron rod

ii. formation of ice from water

iii. formation of salt solution

iv.mixing of cement and water

Explanation: