Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by :

  • Option 1)

    liquation

  • Option 2)

    distillation

  • Option 3)

    zone refining

  • Option 4)

    displacement with Zn

 

Answers (1)

As we learnt in

Leaching -

In this process we use suitable agent  which react with ore to form water soluble complex while impurities are insoluble 

- wherein

Ag2S +NaCN \overset{O2}{\rightarrow} Na [Ag (CN)2

Na [Ag (CN)2] + Zn{\rightarrow} Na2 [Zn(CN)4] +Ag {\downarrow}

 

 

 

 In the process of leaching, we use an angent which reacts with are to form water soluble complex while impurities are insoluble. 

Ag_{2}S+NaCN \xrightarrow[]{O_{2}}Na[Ag(CN)_{2}]

Na[Ag(CN)_{2}]+Zn\rightarrow Na_{2}[Zn(CN)_{4}]+Ag\downarrow


Option 1)

liquation

Incorrect

Option 2)

distillation

Incorrect

Option 3)

zone refining

Incorrect

Option 4)

displacement with Zn

Correct

Most Viewed Questions

Preparation Products

Knockout NEET 2024

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 40000/-
Buy Now
Knockout NEET 2025

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 45000/-
Buy Now
Knockout NEET 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout NEET 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series NEET 2021

Chapter/Subject/Full Mock Tests for NEET, Personalized Performance Report, Weakness Sheet, Complete Answer Key,.

₹ 6999/- ₹ 2999/-
Buy Now
Boost your Preparation for NEET 2021 with Personlized Coaching
 
Exams
Articles
Questions