question_answer

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

Answer:

                  (i) Physical                           (ii) Chemical 1 (iii) Physical         (iv) Chemical                                        (1/2x4=2)