Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?
Cu2I2 is reduced
Evolved I2 is reduced
Na2S2O3 is oxidized
Na2S2O3 is oxidized
The metal which can be used to obtain metallic Cu from aqueous CuSO4 solution is
Na
Ag
Hg
Fe
D.
Fe
Iron (Fe) is used to obtain Cu-metal from CuSO4 (aq) because Fe is more reactive than Cu (and also easily available and is cheaper) thus, replace the copper from CuSO4 to give copper (Cu).
The important advantage(s) of Lintz and Donawitz (L.D.) process for the manufacture of steel is (are)
the process is very quick
operating costs are low
better quality steel is obtained
scrap iron can be used
Which of the following represents the composition of camallite mineral?
K2O.Al2O3.6SiO2
KNO3
K2SO4.MgSO4.MgCl2.6H2O
KCl.MgCl2.6H2O
The chemical composition of slag formed during the smelting process in the extraction of copper is
Cu2O + FeS
FeSiO3
CuFeS2
Cu2S + FeO
In the reaction,
the number of electrons transferred from the reductant to the oxidant is
8
16
4
24
B can be obtained from halide by van- Arkel method. This involves. This involves reaction
2BI3 2B + 3I2
2BCl3 + 3H2 2B +6HCl
Both (a) and (b)
None of the above
Match List I (Substances) with List II (Processes employed in the manufacture of the substances) and select the correct option.
List I (Substance) |
List II (Process) |
||
A. | Sulphuric acid | 1. | Haber's process |
B. | Steel | 2. | Bessemer's process |
C. | Sodium hydroxide | 3. | Leblanc process |
D. | Ammonia | 4. | Contact process |
A | B | C | D |
1 | 4 | 2 | 3 |
A | B | C | D |
1 | 2 | 3 | 4 |
A | B | C | D |
4 | 3 | 2 | 1 |
A | B | C | D |
4 | 2 | 3 | 1 |