Home
Class 12
CHEMISTRY
A certain compound (A) is used in the l...

A certain compound (A) is used in the laboratory for analysis, its aqueous solution gives the following reactions:
a. On addition to copper sulphate, a brown precipitate is obtained which turns white on addition of excess of the `Na_(2)S_(2)O_(3)` solution.
b. On addition to the `Ag^(o+)` ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Identify (A) and give equations for the reactions at steps (a) and (b).

Text Solution

Verified by Experts

Yellow curdy ppt. with `Ag^(+)` confirms the presence of `l^(-)` ion in the compound. The precipitate is insoluble in `NH_(4)OH.`
`[Ah^(+)+l^(-)] rarrAgl].`
The compound (X) gives brown ppt. with `CuSO_(4)` which becomes white when `Na_(2)S_(2)O_(3)` is added. Thus compound X should be Kl.
The reactions :
`CuSO_(4)+2Kl rarr Cul_(2)+K_(2)SO_(4)`
`2Cul_(2) rarr underset("Brown")(Cu_(2)l_(2))+l_(2)`
`2Na_(2)S_(2)O_(3)+l_(2) rarr underset("thionate (white)")underset("Sodium tetra")(Na_(2)S_(4)O_(6))+2Nal`
Promotional Banner

Topper's Solved these Questions

  • PRINCIPLES OF QUALITATIVE ANALYSIS

    AAKASH INSTITUTE|Exercise Try Yourself|1 Videos

  • PRINCIPLES OF QUALITATIVE ANALYSIS

    AAKASH INSTITUTE|Exercise Assignment (SECTION A)|25 Videos

  • POLYMERS

    AAKASH INSTITUTE|Exercise ASSIGNMENT (SECTION-D)|13 Videos

  • REDOX REACTIONS

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION - D|10 Videos

Similar Questions

Explore conceptually related problems

A certain compound (X) is used in laboratory for analysis. Its aq. solution gave the following reactions. On addition to Ag+ ion solution, a yellow ppt. is obtained which is insoluble in NH_(4)OH . Identify (X), giving reactions

An aqueous solution of inorganic compounds (X) gives following reactions. (i) With an aqueous solution of barium chloride a precipitate insoluble in dilute HCl is obtained. (ii) Addition of excess of Kl gives a brown precipitate which turns white on additon of excess of hyposolution. (iii) With an aqueous solution of K_(4)[Fe(CN)_(6) , a brown coloured precipitate is obtained. Identity (X) and gives equation for the reaction for (i),(ii) and (iii) observations.

An aqueous solution of gas (X) shows the following reactions. (i) It turns red litmus blue. (ii) When added in excess to a copper sulphate solution, a deep blue colour is obtained. (iii) On addition of FeCl_(3) solution, a brown precipitate , soluble in dilute HNO_(3) is obtained. Identify (X) and give equations for the reactions at step (ii) and (iii).

An aqueous solution of a gas (X) gives the following reactions : (a) It decolourises an acidified K_2 Cr_2 O_7 solution. (b) On boiling with H_2 O_2 , cooling it and then adding an aqueous solution of BaCl_2 , a precipitate insoluble in conc. HCl is obtained. (c) On passing H_2 S in the solution, white turbidity is obtained. Identify (X) and give equations for steps (a), (b) and (c) .