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

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

Purest form of iron is

• pig iron

• wrought iron

• cast iron

• steel

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,

$8\mathrm{Al}+3{\mathrm{Fe}}_3{\mathrm{O}}_4 \to 4{\mathrm{Al}}_2{\mathrm{O}}_3 + 9\mathrm{Fe}$ the number of electrons transferred from the reductant to the oxidant is

• 8

• 16

• 4

• 24

X Cl₂ (excess) + Y Cl₂ → X Cl₄ + Y↓

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

Ore of Y would be

• siderite

• malachite

• hornsilver

• cinnabar

B can be obtained from halide by van- Arkel method. This involves. This involves reaction

• 2BI₃ $\underset{\mathrm{filament}}{\overset{\mathrm{Red} \mathrm{hot} \mathrm{W} \mathrm{or} \mathrm{Ta}}{\to }}$ 2B + 3I₂

• 2BCl₃ + 3H₂ $\underset{\mathrm{filament}}{\overset{\mathrm{Red} \mathrm{hot} \mathrm{W} \mathrm{or} \mathrm{Ta}}{\to }}$ 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.

• 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