|
Collect information about extraction of metals of low reactivity silver, platinum and gold and prepare a report
|
|
1
|
10868
|
December 20, 2017
|
|
Does the reactivity of a metal
|
|
1
|
564
|
October 20, 2016
|
|
How are metals extracted from mineral ores?
|
|
0
|
565
|
October 20, 2016
|
|
How the metals present in nature?
|
|
0
|
617
|
October 20, 2016
|
|
Do you agree with the statement "All ores are minerals but all minerals need not be ores". Why?
|
|
0
|
8521
|
October 20, 2016
|
|
Show that both air and water are necessary for corrosion of iron
|
|
0
|
5054
|
October 20, 2016
|
|
Classify the following ores into oxides, sulphides, chlorides, carbonates, sulphates
|
|
0
|
5555
|
October 20, 2016
|
|
An ore gives carbondioxide on treatment with dilute acid
|
|
1
|
3309
|
October 20, 2016
|
|
How do you know the reactivity of the metals with chlorine decreases from top to bottom?
|
|
0
|
655
|
October 20, 2016
|
|
Why do we aid impurities to electrolyte during electrolytic extraction of metals?
|
|
0
|
1673
|
October 20, 2016
|
|
What is meant by flux?
|
|
0
|
1973
|
October 20, 2016
|
|
Mention the stages involved in extraction of a metal from its ore
|
|
0
|
884
|
October 20, 2016
|
|
Why do we call oxygen-sulphur group chalcogen family?
|
|
0
|
1017
|
October 20, 2016
|
|
What is activity series?
|
|
0
|
694
|
October 20, 2016
|
|
Why alloying is preferred for metals ? Explain with examples
|
|
0
|
799
|
October 20, 2016
|
|
What is a furnace ? Explain various parts of furnace
|
|
0
|
1200
|
October 20, 2016
|
|
How do you know the reactivity of metals with chlorine decreases from top to bottom?
|
|
0
|
618
|
October 20, 2016
|
|
How do various metals in activity series react with chlorine on heating?
|
|
0
|
867
|
October 20, 2016
|
|
Explain the reaction of various metals in activity with cold water
|
|
0
|
567
|
October 20, 2016
|
|
What is 22 carat gold ? Why it is preferred for making jewellery?
|
|
0
|
2378
|
October 20, 2016
|
|
Give some examples for corrosion
|
|
0
|
1817
|
October 20, 2016
|
|
What are the preventive techniques used in corrosion of metals?
|
|
0
|
1108
|
October 20, 2016
|
|
How do you reduce purified ore to the metal of the top of activity series ? Explain
|
|
0
|
1269
|
October 20, 2016
|
|
How do various metals in activity series react with dilute strong acids?
|
|
0
|
759
|
October 20, 2016
|
|
How do various metals in activity series react with steam?
|
|
0
|
895
|
October 20, 2016
|
|
Do all furnaces have same structure ? Explain
|
|
0
|
1998
|
October 20, 2016
|
|
Write the reactions inside a blast furnance
|
|
0
|
1445
|
October 20, 2016
|
|
What is the role of washing in enriching the ore?
|
|
0
|
738
|
October 20, 2016
|
|
Explain the process of hand picking
|
|
0
|
898
|
October 20, 2016
|
|
Give an example of auto reduction of sulphide ores
|
|
0
|
2641
|
October 20, 2016
|