Match the items of Column I with items of Column II and assign the correct code:

         Column I            Column II

(A) Pendulum         (1) Chrome steel

(B) Malachite          (2) Nickel steel

(C) Calamine          (3) ${\mathrm{Na}}_3{\mathrm{AlF}}_6$

(D) Cryolite            (4) ${\mathrm{CuCO}}_3.\mathrm{Cu} {\left(\mathrm{OH}\right)}_2$

                             (5) ${\mathrm{ZnCO}}_3$

1.  A (1)  B (2)  C (3)  D (4)

2.  A (2)  B (4)  C (5)  D (3)

3.  A (2)  B (3)  C (4)  D (5)

4.  A (4)  B (5)  C (3)  D (2)

Match the items of Column I with the items of Column II and assign the correct
code :

1. A =(1); B=(2); C=(4); D=(5)

2. A=(4); B=(3); C=(1); D=(2)

3. A=(3); B=(4); C=(2); D=(1)

4. A=(5); B=(4); C=(3); D=(2)

Match the items of Column I with the items of Column II and assign the correct code :

     Column I             Column II

(A) Sapphire           (1) ${\mathrm{Al}}_2{\mathrm{O}}_3$
(B) Sphalerite         (2) NaCN
(C) Depressant       (3) Co
(D) Corundum        (4) ZnS
                             (5) ${\mathrm{Fe}}_2{\mathrm{O}}_3$

1.  A (3)  B (4)  C (2)  D (1)

2.  A (5)  B (4)  C (3)  D (2)

3.  A (2)  B (3)  C (4)  D (5)

4.  A (1)  B (2)  C (3)  D (4)

Match the items of Column I with items of Column II and assign the correct
code :

Which of the following is not a mineral of aluminium?

Serpek’s method involves the heating of bauxite with

1. NaOH

2. Na₂CO₃

3. N₂ +C

4. CaCO₃

In the metallurgy of copper, the slag is

1. FeSiO₃

2. CaCO₃

3. CaSiO₃

4. CaO

Galena contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?

1. NaCN

2. Aniline

3. Pine Oil

4. H₂O

In Ellingham diagrams of ${∆}_{\mathrm{r}}\mathrm{G}$ oxide formation ${\mathrm{V}}_{\mathrm{s}}\mathrm{T}$, which of the following graphs has negative slope?

1. C $\to$ CO

2. Fe $\to$ Fe₂O₃

3. Mg $\to$ MgO

4. All of the above

Which of the following is leached with NaCN?