Home
Class 12
CHEMISTRY
A sulphide ore (A) on roasting leaves a ...

A sulphide ore (A) on roasting leaves a residue (B) which on reacting with HCl forms a water soluble compound (C ). Addition of KI to the solution of (C ), another solution (D) is formed. A brown precipitate (E ) is formed when ammonia is passed into an alkaline solution of (D). Identify (A) to (E ).

Text Solution

Verified by Experts

The available data indicates that the sulphide ore is of mercury i.e., it is mercuric sulphide or cinnabar. The chemical reactions involved are listed:
`underset([A])(2HgS)+3O_(2) overset("Roasting")to underset([B]) (2HgO)+2SO_(2)`
`underset([A])(HgO)+2HCl to underset([C])(HgCl_(2))+H_(2)O`
`underset([C])(HgCl_(2))+4KI to underset("Nessler's reagent")underset([D])(K_(2)HgI_(4)) +2KCl`
`underset([D])(2K_(2)HgI_(4))+NH_(3)+3KOH to H_(2)N -underset([E] "Brown ppt.")underset("Iodide of millon's base")(Hg-O-Hg)-I+7KI+2H_(2)O`
Promotional Banner

Topper's Solved these Questions

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    DINESH PUBLICATION|Exercise N.C.E.R.T. Exemplar Problems|26 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    DINESH PUBLICATION|Exercise Matching Type Questions|5 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    DINESH PUBLICATION|Exercise Questions From Board Examinations|43 Videos

  • ETHERS

    DINESH PUBLICATION|Exercise (MCQs)|8 Videos

  • HALOALKANES AND HALOARENES

    DINESH PUBLICATION|Exercise Brain storming multiple choice questions|11 Videos

Similar Questions

Explore conceptually related problems

A sulphide ore (A) on roasting leaves a residue (B) . (B) on heating with chlorine gives (C ) , sulphide in water, addition of excess potassium iodide to a solution of (C ) gives a solution (D) A brown precipitate (E) is formed when a solution of ammonium sulphate is added to an alkaline a solution of (D) . Identify (A) to (E) .

When Bauxite is heated with NaOH solution, the water soluble compound formed is

An inorganic halide (A) reacts with water to form two acids (B) and (c). (A) also reacts with NaOH to form two salts (D) and ( E) which remain in solution. The solution gives white precipitate with both AgNO_3 and BaCl_2 solutions respectively. (A) is a useful organic reagent. Identify (A) to ( E) .