Class 10 Science: Chemical Reactions and Equations

Question 1

A chemical equation is said to be balanced when:

Accepted Answer

It has equal number of atoms of each element on both sides

Question 2

Rusting of iron is an example of which type of reaction?

Accepted Answer

Combination (oxidation)

Question 3

In the reaction Zn + CuSO4 -> ZnSO4 + Cu, zinc:

Accepted Answer

Is oxidized, displacing copper

Question 4

Which of these is a decomposition reaction?

Accepted Answer

CaCO3 -> CaO + CO2 (on heating)