CBSE 12th Standard Chemistry Subject General Principles and Processes of Isolation of Elements Ncert Exemplar MCQ Questions With Solution 2021
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CBSE 12th Standard Chemistry Subject General Principles and Processes of Isolation of Elements Ncert Exemplar MCQ Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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The main reactions occurring in blast furnace during extraction of iron from haematite are______________.
(a)Fe2O3+3CO\(\longrightarrow\)2Fe+3CO2
(b)FeO+SiO2\(\longrightarrow\)FeSiO3
(c)Fe2O3+3C\(\longrightarrow\)2Fe+3CO
(d)CaO+SiO2\(\longrightarrow\)CaSiO3
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Which of the following statements are correct?
(a)A depressant prevents certain type of particle to come to the froth
(b)Copper matte contains Cu2S and ZnS
(c)The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2during the extraction
(d)Zinc can be extracted by self-reduction
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In the extraction of chlorine from brine _____________________.
(a)\(\Delta G^{\ominus}\) for the overall reaction is negative
(b)\(\Delta G^{\ominus}\) for the overall reaction is positive
(c)\(E^{\ominus}\) for the overall reaction has negative value
(d)\(E^{\ominus}\) for the overall reaction has positive value
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When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains
(a)sulphides of copper (II) and iron (II)
(b)sulphides of copper (II) and iron (III)
(c)sulphides of copper (I) and iron (II)
(d)sulphides of copper (I) and iron (III)
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Electrolytic refining is used to purify which of the following metals?
(a)Cu and Zn
(b)Ge and Si
(c)Zr and Ti
(d)Zn and Hg
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CBSE 12th Standard Chemistry Subject General Principles and Processes of Isolation of Elements Ncert Exemplar MCQ Questions With Solution 2021 Answer Keys
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(d)
CaO+SiO2\(\longrightarrow\)CaSiO3
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(c)
The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO2during the extraction
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(b)
\(\Delta G^{\ominus}\) for the overall reaction is positive
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(c)
sulphides of copper (I) and iron (II)
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(a)
Cu and Zn
