Ch-3 Metals and Non-metals (Questions) Page 55

Question 1:	Metallic oxides of zinc, magnesium and copper were heated with the following metals. Metal Zinc Magnesium Copper Zinc oxide - - - Magnesium oxide - - - Copper oxide - - - In which cases will you find displacement reactions taking place?
Answer :	Metal Zinc Magnesium Copper Zinc oxide No reaction Displacement No reaction Magnesium oxide No reaction No reaction No reaction Copper oxide Displacement Displacement No reaction
Question 2:	Which metals do not corrode easily?
Answer :	More reactive a metal is, more likely it is to be corroded. Therefore, less reactive metals are less likely to get corroded. This is why gold plating provides high resistance to corrosion.
Question 3:	What are alloys?
Answer :	Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal. An alloy is formed by first melting the metal and then dissolving the other elements in it. For example, steel is an alloy of iron and carbon.