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. T T F
B. F F T
C. T F F
D. F T T

Answer

B

Explanation

`S_1:CrO_2Cl_2` reacts with water forming `H_2CrO_4` and thus prevents the evolution of deep red vapours.
`CrO_2Cl_2 + 2H_2O to H_2CrO_4 + 2HCl`
`S_2:(CH_3COO)_3Fe+H_2OtoFe(OH)_2(CH_3COO)darr`(brownish red ) +`2CH_3COOH`
`S_3:NO_2^(-)+3I^(-)+4CH_3COOH to I_3^(-)+2NOuarr +4CH_3COO^(-)+2H_2O`
`I_2`+starch `to` white starch paste turns blue .