Evaporation vs Boiling

Q.

Differentiate between Reversible and Irreversible process.

Q. Making of omelette from egg is an irreversible change.

1. True
2. False

Q.

Are the effects of adding heat reversible?

Q.

The conversion of water into steam is an example of

1. evaporation

2. freezing

3. melting

4. liquefaction

Q.

1. Name the phenomenon which causes the following changes :

( c ) Conversion of water into steam.

Q.

A student purchases common salt from the market which is contaminated with Ammonium Chloride (${NH}_{4}Cl$ ). Identify the technique that he should adopt to obtain pure $NaCl$.

1. Mix the sample in acetone and evaporate the decanted solution.

2. Mix the sample in water and evaporate the solution.

3. Mix the sample in water and evaporate the decanted solution.

4. Heat the sample, then mix it in water and evaporate the decanted solution.

Q. Burning is a/an change.

1. reversible
2. irreversible
3. temporary

Q. Among the given options, causes most severe burns.

1. cold water
2. boiling water
3. steam

Q.

Choose the incorrect statement.

1. Washing clothes is a slow change.

2. All liquids have their boiling point at ${100}^o$C

3. Liquids can be converted to solid state below their freezing point.

4. Evaporation can occur at any temperature.

Q.

11. ______ is a surface phenomenon, whereas boiling is a _____.

Q.

What causes more severe burns, steam or boiling water?

1. Steam

2. Steam and boiling water.

3. Boiling water

4. Cold water