Chapter: Metals and Non-metals

Chapter: Metals and Non-metals Class X Science Very Short Answer Type Questions [1 Mark] 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? Ans: It is due to the formation of basic copper carbonate \([CuCO_3.Cu(OH)_2]\). 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. Ans: ‘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. Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature. Ans: Mercury (Hg) exists in liquid state at room temperature. Which of the following two metals will melt at body temperature (37 °C)? Gallium, Magnesium, Caesium, Aluminium Ans: Gallium and Caesium. From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal (a)…