Metals and Non-Metals Chapter 3 One Mark Questions

Amphoteric oxides = Metal oxides showing basic as well as acidic behavior Lustrous = Shining non-metal Carbonic acid = Formed when carbon dioxide is compressed in water at high pressure Sodium hydroxide = Formed when sodium absorbs moisture from air

Al(s) + 3H2O(aq) = Steam is passed over hot Aluminium 2Na(s) + 2H2O(l) = Sodium absorbs moisture from air Mn + HNO3 = React with dilute HNO3 to evolve H2 gas Mg + HNO3 = React with dilute HNO3 to evolve H2 gas

Sulphide and carbonate ores are converted into oxides = Because oxides are easier to be reduced than sulphides and carbonates Oxides of highly reactive metals cannot be reduced by carbon = Because highly reactive metals themselves are good reducing agents, so they can’t be reduced by carbon

<p>Aluminium = Combined state Silver = Free state Gold = Free state Copper = Free state</p> Signup and view all the answers

<p>Rust = Hydrated ferric oxide, Fe2O3$xH2O Solder = Low melting point, used for electrical fuse CuCO3.Cu(OH)2 = Green layer formed on copper plate when exposed to air Aluminium oxide = Conducts electricity in molten state, not in solid state</p> Signup and view all the answers

<p>Iodine = Lustrous non-metal Lead = Non-lustrous metal Sodium = Reacts with water only on boiling Magnesium = Reacts even with steam</p> Signup and view all the answers

<p>Na2O = Ionic compound ZnO = Amphoteric oxide Al2O3 = Amphoteric oxide CO2 = Not specified</p> Signup and view all the answers

<p>Brass = Cu and Zn Bronze = Cu and Sn Copper = Lead and tin =</p> Signup and view all the answers