Consider the following statements and arrange in the order of true/false as given in the codes. `S_1`:Ammonia chloride on heating with an aqueous solu
Consider the following statements and arrange in the order of true/false as given in the codes.
`S_1`:Ammonia chloride on heating with an aqueous solution of `K_2Cr_2O_7` and concentrated `H_2SO_4` produces deep red vapours.
`S_2`:Deep red solution of ferric acetate on boiling with water turns to a brownish red solution.
`S_3`:`NaNO_2` solution acidified with acetic acid produces blue colour with a starch paste contaminated , with iodide ion.
A. T T F
B. F F T
C. T F F
D. F T T
1 Answers
Correct Answer - B
`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 .