Question

Which of the following is/are both reversible and irreversible change?

• A. Formation of curd from milk.
• B. Rusting of iron
• C. There is no such case possible in general.
• D. Both rusting of iron and formation of curd from milk.

Answer 1

The correct option is A

Both rusting of iron and formation of curd from milk.

The formation of curd from milk is an irreversible change, as milk cannot be obtained back from curd.
Melting of wax in a candle is a reversible change, as wax can be solidified and can be converted back to a candle.
Melting of ice to water is a reversible reaction because we can obtain the ice back by freezing
But in general, there is no reaction that is both reversible as well as irreversible.