Incorrect match is :

(a) Purification of Al :Baeyer's method 

(b) polling :Reduction of $C{u}_{2}O$

(C)$FeC{r}_2{O}_4$ (chromite ore) : NaOH/N$a_2$$C{O}_3$

(d) Ag: Mac Arthur cyanideprocess 

Aluminium metal is purified by:

(1) Hoope's process           

(2) Hall's process

(3) Serpeck's process         

(4) Baeyer's process

AgCl on fusion with sodium carbonate, gives:

1. $A{g}_{2}C{O}_3$                       

2. $A{g}_{2}O$

3. $Ag$                               

4. $A{g}_2{C}_2$

$XC{l}_2\left(excess\right) + YC{l}_2 \to XC{l}_4+Y\downarrow ;$ 

$YO \underset{>400°}{\overset{∆}{\to }}\frac{1}{2}{O}_2+ Y,$

Ore of Y would be:

(a) Siderite               

(b) Cinnabar

(c) Malachite             

(d) Hornsilver

Select correct statement :

(a) The decomposition of an oxide into oxygen and metal vapour entropy increases 

(b) Decomposition of an oxide is an endothermic change

(c) To make $∆G°$ negative, temperature should be high enough so that T $∆S°>∆H°$

(d) All are correct statements

Leaching is commercially carried out for in the concentration of:

(1) Galena                           

(2) Argentite

(3) Copper pyrites               

(4) tin stone

$FeC{r}_2{O}_4$ (chromite) is converted to Cr by following steps :

$Chromite\stackrel{I}{\to }NaCr{O}_4\stackrel{II}{\to }C{r}_2{O}_3\stackrel{III}{\to }Cr$

Reagents in I, II and III step might be:

          I-Step              II-Step                   III-Step

(a)$N{a}_{2}C{o}_3/air,∆$          C                             C

(b)NaOH/air,$∆$               C, $∆$                        Al, $∆$

(c)$N{a}_{2}C{o}_3/air,∆$          C, $∆$                         C, $∆$

(d)conc.$H_{2}S{O}_4, ∆$         $N{H}_{4}Cl, ∆$                  $C, ∆$

What is the composition of the anode mud used in the electrolytic refining of silver?

1. Zn, Cu, Ag, Au

2. Zn, Ag, Au

3. Cu, Ag, Au

4. Au only

Incorrect statement for the Hall-Heroult process is: