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Published on: 24/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
Electrolytic refining is used to purify which of the following metals?
Cu and Zn
Ge and Si
Zr and Ti
Zn and Hg
2.
When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains
sulphides of copper (II) and iron (II)
sulphides of copper (II) and iron (III)
sulphides of copper (I) and iron (II)
sulphides of copper (I) and iron (III)
3.
In the extraction of chlorine from brine _____________________.
\(\Delta G^{\ominus}\) for the overall reaction is negative
\(\Delta G^{\ominus}\) for the overall reaction is positive
\(E^{\ominus}\) for the overall reaction has negative value
\(E^{\ominus}\) for the overall reaction has positive value
4.
Which of the following statements are correct?
A depressant prevents certain type of particle to come to the froth
Copper matte contains Cu2S and ZnS
The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2during the extraction
Zinc can be extracted by self-reduction
5.
The main reactions occurring in blast furnace during extraction of iron from haematite are______________.
Fe2O3+3CO\(\longrightarrow\)2Fe+3CO2
FeO+SiO2\(\longrightarrow\)FeSiO3
Fe2O3+3C\(\longrightarrow\)2Fe+3CO
CaO+SiO2\(\longrightarrow\)CaSiO3
1.
(a)
Cu and Zn
2.
(c)
sulphides of copper (I) and iron (II)
3.
(b)
\(\Delta G^{\ominus}\) for the overall reaction is positive
4.
(c)
The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2during the extraction
5.
(d)
CaO+SiO2\(\longrightarrow\)CaSiO3
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