Impurities present in the ore which react to form fusible substance are known as
1. Flux
2. Gangue
3. Mugget
4. Mineral
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
Which of the following is leached with NaCN?
1. Ore of Al
2. Ore of Cu
3. Ore of Ag
4. Ore of Zn
Vapour phase refining can be carried out in case of
1. Ni
2. Zr
3. Ti
4. All of these
Out of the following which metal can be purified by the Van Arkel method?
1. Ti
2. Zr
3. Hf
4. All of these
Which of the following has a negative slope?
1. C CO
2. Fe Fe2O3
3. Mg MgO
4. All of the above
Aluminium is used as a reducing agent in the reduction of :-
1. Cr2O3
2. SnO2
3. ZnO
4. HgO
Percentage of silver in the alloy, German Silver is:-
1. 2.5%
2. 1.5%
3. 10%
4. 0%