Selina Concise Chemistry Class 10 ICSE Solutions Metallurgy Selina Concise Chemistry Class 10 ICSE Solutions Metallurgy Exercise 7(A) 1. Name the three classes in which elements are classified. Which was the first metal used by man? Solution 1. Three classes in which elements are classified are: Metals, Non-metals and Metalloids Copper was the first metal used by man. 2.Name the metal which is a constituent of : (a) Blood pigment (b) Plant pigment Solution 2. (a) The metal which is a constituent of blood pigment is Iron (Fe) (b) The metal which is a constituent of plant pigment is Magnesium (Mg). 3.Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon Solution 3. (a) Nitrogen: It is used to preserve food. (b) Hydrogen: It is used in the hydrogenation of vegetable oils to make ghee. (c) Carbon: It is essential for the growth and development of living beings. 4. Solution 4. The metal which is prese...
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