Neha Sharma, Dimple Tomar and, Dr. Archana Pundirr Solutions for Chapter: How Things React With One Another, Exercise 6: EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT

The process of depositing a layer of zinc on iron is called _____.

Crystals of pure substances are obtained from their solutions by _____ (Crystallisation/liquidification).

Hydrated iron oxide is called _____ (${\mathrm{Fe}}_3{\mathrm{O}}_4$/Rust).

Cutting of wood is a physical change.

During a physical change, new substances are formed.

Energy changes always occur during a chemical change.

Rusting of iron takes place in the presence of water only.

Rusting of iron can be prevented by wrapping iron articles in paper.