Metals and Non-metals — Questions & Answers

Sample questions from Metals and Non-metals

1. Q1. Sulphide ores are commonly converted to oxides by:

   • A.roasting✓
   • B.distillation
   • C.electroplating
   • D.neutralisation
   Solution

   Roasting heats sulphide ores in excess air to form oxides.

2. Q2. Food cans are coated with tin and not with zinc because: (a) zinc is costlier than tin (b) zinc has a higher melting point than tin (c) zinc is more reactive than tin (d) zinc is less reactive than tin

   • A.zinc is costlier than tin
   • B.zinc has a higher melting point than tin
   • C.zinc is more reactive than tin✓
   • D.zinc is less reactive than tin
   Solution

   Zinc is more reactive than tin and could react with food acids to form toxic compounds, so the less reactive tin is used to coat food cans for safety.

3. Q3. In the reactivity series, a metal placed higher can:

   • A.Be displaced by every metal below it
   • B.Displace a metal below it from its salt solution✓
   • C.Never take part in a displacement reaction
   • D.Only displace hydrogen, never another metal
   Solution

   B is correct: the series arranges metals in order of decreasing reactivity, and a more reactive metal pushes out a less reactive one from its compound, as iron does with copper sulphate. A reverses the rule. C denies what the series is for. D is false, since metal-metal displacement is the standard demonstration.

4. Q4. The extraction of a metal from its molten compound by electricity is: In a second comparison:

   • A.electrolytic reduction✓
   • B.roasting only
   • C.calcination only
   • D.filtration
   Solution

   Electrolysis reduces suitable molten ionic compounds to metals.

5. Q5. A substance that can be beaten into thin sheets is:

   • A.malleable✓
   • B.ductile
   • C.sonorous
   • D.brittle
   Solution

   Malleability is the ability to be beaten into thin sheets.

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