Mention the uses of silver.

Which of the following options are correct for the reaction?

$2{\left[\mathrm{Au}(\mathrm{CN}{)}_2\right]}^{-}\left(\mathrm{aq}\right)+\mathrm{Zn}\left(\mathrm{s}\right)\to 2\mathrm{Au}\left(\mathrm{s}\right)+{\left[\mathrm{Zn}(\mathrm{CN}{)}_4\right]}^{2-}\left(\mathrm{aq}\right)$

A. Redox reaction

B. Displacement reaction

C. Decomposition reaction

D. Combination reaction

Choose the correct answer from the options given below:

Statement I: Leaching of gold with cyanide ion in absence of air / ${\mathrm{O}}_2$ leads to cyano complex of $\mathrm{Au}$(III).

Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

Match List I with List II : (Both having metallurgical terms)

Choose the correct answer from the options given
below:

Fill in the blank with a suitable word:

These places contain thick deposits of coal are Dhanbad, Neyveli and Raniganj located in _____ (Delhi/Bengaluru).

Fill in the blank with the correct word given in the bracket.

_____ [coal/water] is used as natural fuel.

(Electricity, early man, nylon, cook, deforestation, protecting.)

Coal is burnt to produce _____.

Name a mineral.