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How many of the following are correct st...

How many of the following are correct statements.
-Valency of an element is always a whole number.
- In neutrilisation reaction between sulphuric acid and potassium `SO_(4)^(--)` and `K^(+)` ion are spectator ions.
-Leade is ………..stable in +2 oxidation state due to inert pair effect.
-Thallium salts in +3 oxidation state act as good reducing agents.
`-2H_(2)S+SO_(2)to3S+2H_(2)O` is disproportionation reacts.
-Fluorine cannot be obtained from fluoride by chemical methods.

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