Question:
Classify the following as physical or chemical properties (CBSE 2012)
1. The composition of a sample of steel is : $98 \%$ iron. $1-5 \%$ carbon and $0-5 \%$ other elements.
2. Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
3. Metallic sodium is soft enough to be cut with a knife.
4. Most metal oxides form alkalis on interacting with water.
Solution:
1. Physical
2. Chemical
3. Physical
4. Chemical.
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