Metal and Metallurgy

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METAL METALLURGY PART-6
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Lead Atomic no 82 Mass number 207 Occurrence
and extraction Lead occurs in nature mainly in
the form of its ores. There are various ores of
it exist in nature like galena(PbS), Cerussite(PbC
O3), anglesite(PbSO4) etc. The main ore is galena
(PbS) from which lead is extracted by a
self-reduction process. Lead is the most stable
element among all the elements Properties Lead
is a soft bluish grey metal and it is used as a
paper maker. It is a heavy metal It does not
react with dry air but reacts with moist air and
forms the layer of hydroxide first and then of
carbonate
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• Uses of Lead Lead is a very useful metal and it
  is used in making alloys, lead accumulators, lead
  shots(bullet) and coverings of electric cables,
  lead chambers, lead pipes, lead- arsenic bullets,
  in nuclear research etc.
• Compounds
• Lead Oxide(PbO) This is a volatile yellowish
  compound which is called Litharge. It is an
  amphoteric oxide and it is used in rubber
  industry, in the manufacture of flint glasses and
  storage batteries
• Lead carbonate(PbCO3) This is also called white
  lead due to its white colour and it is insoluble
  in water but
• soluble in HCl and HNO3. It is basically
  used
• in making white pigment

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• Lead acetatePb(CH3COO)2 This is also called
  SUGAR OF LEAD and it is white crystalline sugar
  like substance soluble in water and its crystals
  are sweet in taste
• Alloys
  Composition
• Type metal Pb(75),
  Sb(20) Sn(6)
• Solder
  Pb(50-30) Sn(50-70)
• Pewter
  Sn(75) Pb(25)

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Uranium Atomic no 92 Mass no 238 Element
f-block (radioactive) Occurrence and extraction
It is a rarely found element in nature and it
does not occur in free state. Almost all minerals
of it is radioactive. The main ore of uranium is
pitch blende from which it is extracted
Uranium is also called METAL OF HOPE Uses
Uranium carbide is used as a catalyst in
production Of ammonia by Habers process. Uranium
is used in the production Of nuclear energy
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