Question

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Answer 1

1. lead, tin
2.mercury
3.most reactive-K
least reactive -Au
4.Aluminium
5.silver
6.Graphite
7.acidic in nature
8 non metals react with water to produce acids.
9.When a metal of higher electrochemical series react with a metal of lower electrochemical series then that reaction is called displacement reaction.
10. Silver is lower than hydrogen in electrochemical series, that's why....

Answer 2

1) Gold and Copper .
2) Mercury
3) Most reactive = K
    Least reactive = Au
4) Aluminium
5) Silver
6) Graphite
7) Oxides of non-metals are generally acidic and neutral in nature .
8) Non-metals do not react with water .
9) Displacement reaction is a reaction in which more reactive element                 displaces less reactive element.         
10) Because they do not give out electrons required for the reduction of                  hydrogen ions present in acid .