| ⇦ | 
| ⇨ |
One of the following metals is obtained by leaching its ore with dilute cyanide solution, Identify it.
Options
(a) titanium
(b) vanadium
(c) silver
(d) zinc
Correct Answer:
silver
Explanation:
Cyanide process: ‘Mac Arthur – forest cyanide process.’ The powdered argentite ore is agitated with a dilute solution of NaCN(0.5%) while a current of O₂ is constantly passed. The metallic silver or silver from the ore dissolves forming sodium argentocyanide. 2Ag₂S +8NaCN + O₂ + 2H₂O → 4Na[Ag(CN)₂] + 4NaOH + 2S. The soluble silver complex is filtered and treated with zinc dust when silver gets precipitated. 2Na[Ag(CN₂)] + Zn →Na₂[Zn(CN)₄] + 2Ag↓.
Related Questions: - Which of the following has the minimum bond length ?
- In an exothermic reaction(reversible) which of the following has positive value
- Which of the following contains amino group
- Schottky defect generally appears in
- Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻
Topics: Surface Chemistry and Isolation of Elements
(88)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following has the minimum bond length ?
- In an exothermic reaction(reversible) which of the following has positive value
- Which of the following contains amino group
- Schottky defect generally appears in
- Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻
Topics: Surface Chemistry and Isolation of Elements (88)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply