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.

Options

A. `S_(1),S_(2)` and `S_(3)` are correct
B. `S_(1),S_(3)` and `S_(4)` are incorrect
C. Only `S_(3)` and `S_(4)` are in correct
D. All are incorrect

Answer

1

Explanation

`CrO_(2)Cl_(2)+2H_(2)OrarrH_(2)CrO_(4)+2HCl`
`2. Pb^(2+)+SO_(4)^(2-)rarr PbSO_(4)darr("brown ring is not clarly visible ")`
`3. (CH_(3)COO)_(3)+H_(2)OrarrFe(OH)_(2)underset("brownish-rad")((CH_(3)COO)darr+2CH_(3)COO )`
`4. NO_(2)^(-)+3I^(-)+4CH_(3)COOHrarrI_(3)^(-)+2NOuarr+4CH_(2)COO^(-)+2H_(2)O`