Q6 Read the following extract carefully and make the notes with the belp of the clues given
below
7.5
Naturally occulting platinum and platinum rich alloys have been known for a long
time. This Spaniards named the metal platina or little silver, when they first encountered it in
Colombia. The platinum group metals are modiun, ruthenium, palladium, osmium, iridium and
place of these platinum is the most important. These metals are very similar in many ways
and are extremely rare.
On an average, there is only a gramme of ruthenium in each tone of rock and barely a
grame of rhodium in over a 1000 tonnes of rock! Platinum s wear and tamish resistance
characteristics are well suited for making fine jewellery. Other distinctive properties include-
resistance to chemical attack, excellent high temperature characteristics and stable electrical
properties. These metals are uniquely durable and can be used extremely efficiently meaning
that a very little goes a very long way. When recycled, over 96 percent can be recovered. The
platinum group merais PGMS play an important role in our everyday life, for they are used
in so many things from fountain pens to aircraft turbines. In fact, one in four of the goods
manufactured today either contain one or the other of these metals. The catalytic converter-a
pollution control device is the largest application of platinum group merals
Title: Platinum Group or Merals
First encountered:
2]Platinum group metals include:
SINanme and Availability:
M.
Q7A] Match the columns:
1. Murasaki Shikibu
ii, novella
iii. Don Quixote
Wife
a. Cervantes
b. Bankimchandra Chattopadhyaya
c. Tale of Genji
d. New
Answers
Answer:
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Answer:
*Read the following extract carefully and make the notes with the help of the clues given below:*
Naturally occurring platinum and platinum - rich alloys have been known for a long time. The Spaniards named the metal ‘platina’ or little silver, when they first encountered it in Colombia. The platinum group metals are rhodium, ruthenium, palladium, osmium, iridium and platinum. Of these, platinum is the most important. These metals are very similar in many ways and are extremely rare.
On an average, there is only a gramme of ruthenium in each tonne of the rock and barely a gramme of rhodium in over a 1000 tonnes of rock! Platinum’s wear and tarnish resistance characteristics are well suited for making fine jewellery. Other distinctive properties include - resistance to chemical attack, excellent high temperature characteristics and stable electrical properties. These metals are uniquely durable and can be used extremely efficiently - meaning that a very little goes a very long way. When recycled, over 96 percent can be recovered. The platinum group metals - or PGMS - plays an important role in our everyday life, for they are used in so many things from fountain pens to aircraft turbines. In fact, one in four of the goods manufactured today either contain one or the other of these metals. The catalytic converter - a pollution control device - is the largest application of platinum group metals.