SCIENCE: CLASS X - DAILY REVISION SYLLABUS FOR STUDENTS

SCIENCE: CLASS X - DAILY REVISION SYLLABUS FOR STUDENTS CHAPTER 1: METALS AND NON-METALS VERY SHORT ANSWER TYPE QUESTIONS [1 MARK] 1. A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What could this green substance be? Answer. It is due to the formation of basic copper carbonate \( [\text{CuCO}_3.\text{Cu(OH)}_2] \). 2. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z. Answer. ‘X’ is carbon, ‘Y’ is diamond as it is the hardest natural substance and ‘Z’ is graphite as it is a good conductor of electricity. 3. Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature. Answer. Mercury (Hg) exists in liquid state at room temperature. 4. Which of the following two metals will melt at body temperature (37 °C)? Gallium, Magnesium, Caesium, Aluminium Answer. Gallium and Caesium. 5. From amo…