General Principles and Processes of Isolation of Elements - Live Session - 1 April 2021Contact Number: 9667591930 / 8527521718General Principles and Processes of Isolation of Elements - Live Session - 1 April 2021Contact Number: 9667591930 / 8527521718Identify the metal M, which has the following extraction principle.
1. Mg
2. Pb
3. Sn
4. Fe
Which among the following is not an oxide ore?
1. Malachite
2. Cuprite
3. Zincite
4. Bauxite
The chemical composition of "slag" formed during the smelting process in the extraction of copper is:
1. Cu2 + FeS
2. FeSiO3
3. CuFeS
4. Cu2S + FeO
The correct statement among the following is:
| 1. | In the decomposition of oxide into oxygen and gaseous metal, entropy increases. |
| 2. | Decomposition of oxide is an endothermic change. |
| 3. | To make ∆G° negative, the temperature should be high enough so that T∆S° > ∆H°. |
| 4. | All of the above. |
The reduction of an oxide by aluminium is called:
(1) Bayer's process
(2) Goldschmidt's aluminothermite process
(3) Hall's process
(4) van Arkel process
AgCl on fusion with sodium carbonate, gives:
1.
2.
3.
4.
Consider the following reactions at 1000 oC.
(I) ZnS + 1/2O2(g) \(\xrightarrow[]{\Delta }\) ZnO(g); ∆Go = -360 kJ mol-1
(II) Cs + 1/2O2(g) \(\xrightarrow[]{\Delta }\) CO(g); ∆Go = -460 kJ mol-1
Choose the correct statement about the above reactions at 1000 oC:
1. ZnO is more stable than CO
2. ZnO can be reduced to Zn by C
3. ZnO, and CO are formed at an equal rate
4. ZnO can not be reduced to Zn by C
Percentage of silver in the alloy, German Silver is:-
1. 2.5%
2. 1.5%
3. 10%
4. 0%
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
Name the metal M which is extracted on the basis of following reactions,
4M+8CN-+2H2O+O24[M(CN)2]-+4OH-
2[M(CN)2]-+Zn[Zn(CN)4]2-+2M
1. nickel
2. silver
3. copper
4. mercury
The second most common element on the earth is:
1. silicon
2. hydrogen
3. nitrogen
4. oxygen
Which substance is used as basic refractory material in furnace?
1. Al2O3
2. SiO2
3. CaO
4. Fe2O3
Iron is made inactive or passive by:
1. H3PO4
2. conc. HNO3
3. conc. H2SO4
4. dil. HNO3
Liquation is used to purify:
1. Pb
2. Sn
3. Bi
4. All