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Consider the following statements : S(...

Consider the following statements `:`
`S_(1) :` A metal chloride on heating with an aqueous solution of `K_(2)Cr_(2)O_(7)` and concentral `H_(2)SO_(4)` produces deep red vapours.
`S_(2) :` Lead nitrate dissolved in water responds to brown ring test.
`S_(3) :` Deep red solution of ferric acetate on boiling with water turns to brownishred solution.
`S_(4) : NaNO_(2)` solution acidified with acetic acid produces blue colour with iodide solution and starch paste of these.

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