Q11 of 55 Page 1

Write the chemical reactions involved in the extraction of silver from silver ore?

Extraction of sliver is done by the process of oxidation. In this process, the crude metal is recovered from its ore by leaching it with NaCN or KCN.


The chemical reactions involved include:




More from this chapter

All 55 →
9

A solution of is electrolysed between platinum electrodes using a current of 5.0 Ampere, for 20 minutes. What mass of Nickel will be deposited at the cathode?

(Given At mass of Ni = 58.7 g/mol, 1 F = 96500 C/mol)


 10

Define half-life of a reaction. Write the expression of half-life for

a) Zero order reaction and


b) First order reaction


 12

Name two most important allotropes of Sulphur. Which one of the two is stable at room temperature? What happens when the stable form is heated above 370 K?

OR


(i) Write the conditions to maximise the yield of by contact process.


(ii) Why is <<for in water?


 13

Complete the equations:

a)


b)