Available Answers

1. 1.

   Fill in the blanks. 

   1. ______ is the purest form of iron and contains less than 0.1 per cent of carbon. 
   2. ______ is a bluish white metal used to make dry cells and electrodes. 
   3. _____ is a silvery metal which is liquid at room temperature. 
   4. _____ is used in fireworks as it burns with a dazzling white flame. 
   5. _____ is used as a catalyst in petroleum refining and hydrogenation. 
2. 2.

   Write /choose the correct answer. 

   1. Non-metals are ______ (malleable/non-malleable).
   2. Non-metals have _____ tensile strength. 
   3. Non-metals do not react with acids and bases at normal temperature conditions. (True/False)
   4. ______ is used as a rocket fuel. 
   5. Chlorine is used in vulcanization of rubber. (True/False)
3. 3.

   Answer in one word. 

   1. These elements possess properties of both metals and non-metals. 
   2. It plays a vital role in photovoltaic industries. 
   3. it is used to produce specialized glass for military operations. 
   4. it is used to make filaments of incandescent light bulbs. 
   5. it is used in storage batteries. 
4. 4.

   Name the following. 

   1. A form of iron that contains 2-4 per cent carbon and is the most impure form of  iron. 
   2. A metal used in making alloys like duralumin and magnalium which have low density. 
   3. A metal used in the extraction of gold and silver. 
   4. A non-metal essential for respiration and combustion. 
   5.  A non-metal used in vulcanization of rubber. 
   6. A non-metal used to prepare teflon. 
5. 5.

   Identify the error in the given statements. Circle the incorrect word and write the correct word in th blank. 

   1. Potassium is a metal which is liquid at room temperature. 
   2. The corrosion of sulphur is called rusting. 
   3. Aluminium is used to make alloys like brass. 
   4. Calcium is used for making fuse wires. 
   5. Oxygen is used as a propellant for spacecraft. 
   6. Tungsten is used to manufacture rectifiers. 
6. 6.

   1.  Copper and silver occur in ______.
      1. free state
      2. combined state
      3. both free and combined states
      4. none of these

   2. Which of the following metals has/have low density?

      1. Lithium
      2. Sodium
      3. Potassium
      4. All of these

   3. In which of the following methods a protective zinc coating is applied to iron articles to prevent them from rusting?

      1. Oiling
      2. Painting
      3. Galvanization
      4. Alloy of formation

   4. Which of the following metals is used in making car batteries?

      1. Lead
      2. Gold
      3. Silver
      4. Zinc

   5. Which of the following non-metals is used to manufacture bleaching powder?

      1. Nitrogen
      2. Hydrogen
      3. Sulphur
      4. Chlorine

   6. Which of the following metalloids is used in thermal imaging cameras?

      1. Silicon
      2. Germanium
      3. Tungsten
      4. Antimony