In nature,carbon is found in elemental forms as:

Classify the following as physical or chemical properties:
$(a)$ The composition of a sample of steel is: $98\%$ iron,$1.5\%$ carbon,and $0.5\%$ other elements.
$(b)$ Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
$(c)$ Metallic sodium is soft enough to be cut with a knife.
$(d)$ Most metal oxides form alkalis on interacting with water.

Rusting of an article made up of iron is called

Which of the following is an element?

Classify the substances given in the figure into elements and compounds.

What is meant by a pure substance?